I agree. The issue you're referring to is the degrading 'quality' of the mix.

I just wanted to point out that mixing quality goes straight to zero if the xpub gets into wrong hands. Obviously such a wallet should no longer be used.

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The attack i mentioned does not degrade the quality of the mix. It also goes to zero immediately.

So you can do everything right, don't share xpub and you are not mixed either - at all.