What does ‘Allah forgive me;’ mean?

I had an old friend who has recently asked me for a relationship. He was an atheist when I knew him, but he was against drinking, intimacy with women and being touched by and touching women. I just thought he was autistic. Which he is. I recently looked at his Facebook page; and he’s a member of a Muslim group called ‘Allah forgive me.’ Does that mean he converted to Islam, or is it just a figure of speech? If so, what does it mean?

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I’m not a Muslim. I’m one of the ‘People of the Book.’
What does ‘Allah forgive me;’ mean?
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