No core project specified

First let me apologise if this is considered a duplicate of #1045906: Tell me there's no core version specified before bothering to look at all the modules. - I wasn't sure, as that one is marked as fixed, is included in Drush Make 2.0, but the problem persists for me.

aegir:~$ php /var/aegir/drush/drush.php make https://github.com/mig5/builds/raw/master/atrium_oatime.build /var/aegir/platforms/openatrium --debug
Found command: make (commandfile=drush_make) [0.09 sec, 7.44 MB]                                                                                              [bootstrap]
Initializing drush commandfile: drush_make [0.09 sec, 7.45 MB]                                                                                                [bootstrap]
Initializing drush commandfile: drush_make_d_o [0.09 sec, 7.45 MB]                                                                                            [bootstrap]
Initializing drush commandfile: provision [0.09 sec, 7.45 MB]                                                                                                 [bootstrap]
Load alias @self [0.09 sec, 7.46 MB]                                                                                                                             [notice]
Load alias @server_master [0.09 sec, 7.47 MB]                                                                                                                    [notice]
Loading apache driver for the http service [0.1 sec, 7.49 MB]                                                                                                    [notice]
Executing: mkdir '/tmp/drush_make_tmp_1297468000' [0.1 sec, 7.54 MB]                                                                                             [notice]
Executing: mkdir '/tmp/drush_make_tmp_1297468000/__download__' [0.11 sec, 7.54 MB]                                                                               [notice]
Executing: ls '/tmp/drush_make_tmp_1297468000/__download__' [0.12 sec, 7.54 MB]                                                                                  [notice]
Calling chdir(/tmp/drush_make_tmp_1297468000/__download__)
Executing: curl -LOD '/tmp/drush_make_tmp_1297468000/__header__' 'https://github.com/mig5/builds/raw/master/atrium_oatime.build' [0.13 sec, 7.54 MB]             [notice]
    % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                   Dload  Upload   Total   Spent    Left  Speed
100   437  100   437    0     0   1345      0 --:--:-- --:--:-- --:--:--     0
Calling chdir(/var/aegir)  
Executing: ls '/tmp/drush_make_tmp_1297468000/__download__' [0.48 sec, 7.55 MB]                                                                                  [notice]
  atrium_oatime.build      
Executing: mv '/tmp/drush_make_tmp_1297468000/__download__/atrium_oatime.build' '/tmp/drush_make_tmp_1297468000/atrium_oatime.build' [0.49 sec, 7.56 MB]         [notice]
Executing: rm -f '/tmp/drush_make_tmp_1297468000/__header__' [0.5 sec, 7.56 MB]                                                                                  [notice]
Executing: rm -rf '/tmp/drush_make_tmp_1297468000/__download__' [0.51 sec, 7.57 MB]                                                                              [notice]
Calling unlink(/tmp/drush_make_tmp_1297468000/atrium_oatime.build)
No core project specified. [0.52 sec, 7.57 MB]                                                                                                                [error]
An error occurred at function : drush_drush_make_make [0.53 sec, 7.58 MB]                                                                                     [error]
Command dispatch complete [0.53 sec, 7.57 MB]                                                                                                                    [notice]
Peak memory usage was 7.58 MB [0.53 sec, 7.57 MB]                                                                                                                [memory]

It works fine in beta11.

Am I doing something wrong or did that patch per the other ticket not actually fix the issue?

Please mark as a duplicate if it's that other ticket that needs to be reset to needs work.

Feel free to look at that stub makefile as above, I am sure I'm setting a project of type core. Any idea what I'm doing wrong?