This seems like background work related to labs import rather than a task per se, moving to radar.

Ping @JAllemandou Did you talk with labs team about this?

I discussed this with @ArielGlenn. He told me he wouold investigate.
Ping @ArielGlenn?

After my initial ping, I dropped this ball. Picking it back up again.

If I remember correctly the ar_comment was visible in labsdb before moving to separate comment table.

I think it would be good that the comments would be still visible because it is one of the rare places where to get data about deletion reasons. In example how many articles were deleted because notability, were there notability discussion and how many days the average discussion, did the creator of the page participate to discussion etc.