I understand your point of view, truly. But I disagree with the premise that because I have used that phrase we have to throw the baby out with the bath water. Essentially, the point of copy is not to follow each and every grammar rule. It is to make sales. Nothing more, nothing less.
Also, here's an interesting post from the Columbia Journalism Review: https://www.cjr.org/language_corner/overwhelming-overwhelm-w.... The author acknowledges that the word "overwhelm" has been used as a noun since the 1500s.
It may not be everyone's cup of tea. But it doesn't need to be.
So there are two truths here. Yours and mine, which can happily coexist :)