In any case, blindly apply upscaling is just wrong ..
You apply it to where it is needed. Not every scene need the same treatment.
The article simply says "Trust me, just don't."
No it doesn't. It says “don't, Unless you're extremely surgical with it and know exactly what you're doing”.
Which is a sensible piece of advice.
> Don't use Topaz AI, Anime4k, RealESRGAN, RIFE, etc. Trust me, just don't.
Is what the submission says about Topaz and similar.
> Applying any kind of post-processing[4]
Is what the footnote you quoted is linked to.