This question already has an answer here:
That profile seems harmless. Because the user hasn't contributed any content, the SEO value (and the overall visibility) of his profile is practically zero.
Historically, unless the profile is especially harmful or abusive, we generally let people put whatever they want in there. The one thing that we are a bit strict on is user names and Gravatars, since they are far more visible; they show up everywhere that a user posts a question or answer.
All that said, the user visited one day and never came back, so I doubt that the profile will be missed. Unless there are objections (i.e. historical reasons), I'll go ahead and delete the account.
This particular scenario is an extremely rare edge case; reporting it on Meta seems to have served the purpose adequately.