Agreed, but note that all communications with the US Patent and Trademark Office must be in writing so they can (and will) become part of the official record. That record is accessible by the public online using TSDR. And your identity can be obtained through discovery in litigation. So, while you might temporarily hide the identity, it can be obtained by a skilled litigator.
It does, however, make one a "hard target" rather than a "soft target". If he is, for instance, trying to obscure his relationship to a trademark in say, the adult entertainment industry, that may be sufficient to protect his good name outside of litigation.