Was the wheel invented before the wall? is trivially answerable by looking up the history of "Wheel" and "Wall" on Wikipedia.
That is why I -- providing those links, plus a link to the "Wall of Jericho" -- asked the OP what remained unanswered.
My understanding was that "claims" that are trivially answerable aren't on-topic on Skeptics.SE. I was asking that comment with the intention to vote-to-close unless the OP came up with some non-trivial angle.
There were other comments which I don't quite recall, and the question was gathering downvotes (I assume as the lack of research done by OP was obvious).
Coming back a couple of minutes later, I find that my comment has been deleted. Instead, we now find an answer by another user, that basically provides the same links as my comment. Both question and answer start collecting upvotes.
1) Why was my comment considered delete-worthy? Isn't a request for clarification of the question what comments are for?
2) Why was this done within minutes, as if I had been posting spam or attacking the OP?
3) Why is an answer with basically the same content left standing at the same time?
(Did someone take exception at the one word ("unsurprisingly") with which I expressed myself unsurprised that the POTUS would make a trivially false claim?)
4) What is the policy on trivial Wikipedia lookups: officially answerable, or reason for vote-to-close?