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I'm wondering what has changed in 20 years. For new people I have recommended it, maybe it's out of date now. I will look at the Greg Nuckols stuff for more up to date info.
TGR-
The most significant change in the last 20 years in powerlifting-focused strength world is the change in the majority of competitors from equipped to unequipped/raw lifting. Taking the squat as an example, a squat suit changes the way you perform the lift, to stop it folding you over, you need to push back into it, keeping shins as vertical as possible. Rippetoe, Westsiders, everyone back then coached the squat this way as it was how you'd compete. They didn't distinguish between a squat suit or not because nobody competed without a suit in that time period, so all your raw squatting should mimic that competition form. Then, as more and more lifters went to unequipped powerlifting knees started coming forward, quads became more of a priority and a wider toes-out stance became less beneficial.
The bench equivalent would be everyone cuing ' tuck your elbows!' which was designed to help touch the bar to the chest in a bench shirt. But none of those older texts will add that context as it was an assumption the lifter would use it when competing.
Ptown
20 years ago Rippitoe wrote a decent book for skinny 18 year olds who have never trained to cover the first 6 months of newbie gains. Since then it seems to have become a religion. I find that a bit annoying.