There has been a lot of bad advice given on these forums over the years. "Just buy brake pads from Autozone", and "when you tear down your engine just throw all the bolts in a bucket because a bolt is a bolt" come to mind.
"I've never bothered to learn about what is overwhelmingly considered a crucial braking technique because fast car" isn't technically advice but the implication still puts it in that same category.
Maybe there is some confusion about what heel/toe is? Maybe? It generally refers to rev-matching downshifts regardless of which foot or part of the foot is being used.
If one is downshifting one's conventional manual transmission (syncro or dog-box) without matching revs one is leaving time on the table and wearing stuff out, plus risking a spin on entry in the case of rear-wheel drive. That's not subject to debate despite current indications to the contrary.