The step described in this page is not at all necessary. If you want to customise the products list presented on page admin/commerce/products , first go to modules: Views, and enable the "Views UI" module.
Then go to store → products , click on the gear at the right top corner of the page, then on "Edit View", because the product list page is produced by the Views module.
Click on the gear in the right top corner, to have the hyperlink 'Edit view' appear.
Follow the instructions on that page, section called "Customizing On-site Product Administration".

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