Multiple value fields in a multigroup

As far as I understand you can have multiple value fields in a multigroup in CCK 3.0.

A comment was made here and I'm curious to know if it's right. It was:

Last I checked Content Multigroup wasn't allowing multiple value fields in multigroup, probably because it uses delta (that usually serves as item id in multiple values setup) as group id. That means, you can't use such powerful modules as Content Taxonomy, because each term is essentially "field value" and multiple terms == "mutiple values".

Any feedback if this is correct or not?