I can't think of how coinjoin helps that scenario.
if your address is doxxed or might be doxxed in the future use coinjoin to conceal your activity
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With a leaked xpub the whole wallet is doxxed so you have make the point to coinjoin into a *different wallet* So yeah, it's a way out of a mess but one that is better to avoid in the first place.
coinjoin on the way in