I've heard the same advice, and frankly I think it depends on how strong you feel your position is as well, and so I think it's really important to have a realistic model of your prospects.

If you feel your job prospects are generally weak, you might not be comfortable standing firm on things like keeping salary history hidden. That seems reasonable to me, as long as you're not selling yourself short. "Impostor syndrome" is a thing.

I would actually reveal salary history if it's a "favorable" history -- if I would be happy taking a similar amount, because I value something about this new job more than my previous employment.