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They don't need to mention it because they handle it on behalf of the client. Them recommending best practices like using separate domains makes as much sense as them recommending what TLS configs to use.
>or where Apple or Google or Mozilla have a listing hosting best practices that include avoiding false positives by Safe Browsing…
Since were those sites the go to place to learn how to host a site? Apple doesn't offer anything related to web hosting besides "a computer that can run nginx". Google might be the place to ask if you were your aunt and "google" means "internet" to her. Mozilla is the most plausible one because they host MDN, but hosting documentation on HTML/CSS/JS doesn't necessarily mean they offer hosting advice, any more than expecting docs.djangoproject.com to contain hosting advice.
Google is happy to take their money and show scammy ads. Google ads are the most common vector for fake software support scams. Most people google something like "microsoft support" and end up there. Has Google ever banned their own ad domains?
Google is the last entity I would trust to be neutral here.