You didn't mention mnemonic systems: mnemonic major, method of loci, peg system, acronyms, acrostics etc. Does nobody else use these and are they too obvious/useless to mention?

I don't use those, I never learnt any mnemonics system (though I'm aware of them). I expect that mnemonics aren't nearly as popular here as spaced repetition is.

For ankifying knowledge, these rules are essential. Do people disagree?

Nope, I rely on those all the time (I remember reading that specific article at least three times, and wish more people would use them when I try using an Anki deck made by someone else (which I usually avoid anyway, making your own is more effective).