But does this have anything to do with wabisabi coinjoin plugin? The video tells us just about some software (probably wasabi wallet) which in 2019 screwed up, reused addresses and joined multiple mixed outputs. Or it could have been the user himself who screwed up.

It does not mean that *another* implementation will share the same flaws. (I did not look, it could reuse code, but the video does not claim nor imply that.)

Don't reuse addresses...

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This was using Wasabi's old zero link implementation, not wabisabi

Nothing to do with wabisabi. Think twice before spreading FUD