You seem to think that the (speedy) deletion criteria are much more liberal than they actually are. In fact, they are very narrow, so that only "obvious commercial spam" or otherwise obviously inappropriate articles get deleted in this way.

"We could not verify this fact" is not a valid reason for deletion, let alone speedy deletion. The requirement is verifiability (it must be possible to verify this fact using reliable sources), not verification (it's OK if the sources are not immediately available).

(https://en.wikipedia.org/wiki/Wikipedia:Criteria_for_speedy_...)