YouTube has deactivated comments on all auto-generated YouTube Art Tracks, including the videos created when you distribute to YouTube Music through DistroKid.
This is handled by YouTube directly, and not something that DistroKid (or any other distributor) has control over.
However, comments can be enabled for these art tracks if you have an Official Artist Channel. For more information on making your channel and Official Artist Channel in YouTube, check out this article: https://support.distrokid.com/hc/en-us/articles/360036924633.
For more information about art tracks in YouTube, see Google's article here: https://support.google.com/youtube/answer/6007071.
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