I don’t know why so many guys are afraid of just directly working their forearms these days. lol
Not everyone needs direct work, but if you do you aren’t going to see great progress from “deadlifts and rows” alone obviously. The standard wrist curl, hammer curl, reverse curl, etc. has worked for generations.
A personal favorite of mine are kpipe curls:
Forearm exercises are just like any other. Move up in poundages regularly, gain bodyweight, be consistent. The guy in those videos, for instance, trains his forearms regularly with pinwheel/hammer curls, seated barbell and standing dumbbell wrist curls, and DB/EZ kpipe curls. Is it some kind of coincidence that he has beastly forearms? Obviously not.
If you are just throwing in some hammer curls at the end of your back/biceps workout once in a while, don’t expect to see much progress.