A: Look this, the perfect programming language I invented is the best.

B: (tick the checklist and sent it back)

It's a variation of the "checklist explanation of why your proposal is a failure" that was in vogue back in the day, and is less often seen these days. I first saw it in the 90s.

It's a joke. You don't "use" it except to diss a language you don't like.