Yes, if the kid is being destructive the sources even say not to ignore that behavior. They also give suggested intervention strategies (though I didn't see a lot of evidence for why they chose those intervention strategies).
And obviously some kids have psychological issues that make all of this meaningless.
I imagine ignoring a bipolar toddler's tantrum is not going to have a meaningful impact. Or at least that is my experience from dealing with bipolar adult tantrums.
Ignoring other bad behavior isn’t the same. If a child is hurting someone, is being destructive, or ignoring what you say you absolutely should do something about it. I’ve seen plenty of parents that don’t and it doesn’t work.