You're trying to correct Dr Adams?
Yes. I wouldn't argue with something he says about criminal justice, but I am perfectly competent to correct grammar. The object of a preposition cannot be the subject of a sentence.
“I did a grammar check and found that both “were” and “was” are correct.”
No. “One were” is not correct. Therefore, “no one were” is also wrong, as is “none were.”
I wouldn’t doubt that there are people who hold themselves out as authorities but don’t know any better, but they should.
It is one of those errors seen so often that it has come to seem normal, but it is, was, and will always be wrong, no matter how many drooling moron academitards say differently.