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I don't want to dox myself but about a year ago when my employer forgot to notify AWS about switching our production traffic (about 5K rps at that time) from one ELB to another we failed requests for several minutes before we decided to just switch back to the old ELB then ask them to do a prewarming before we switched again.

Possible. It is still in the documentation: https://aws.amazon.com/articles/1636185810492479#pre-warming

The "advance notice" and "over provision" advice is still being given for things that could scale up fairly large. (where fairly large isn't anything that exciting, really)

The poster was talking about ALBs. I'm not experienced enough with them to know whether the claim is true.

I do know on ELBs though, pre-warming is essential for high throughput.

It definitely still applies.