That's not a contradiction. He says "someone signed up an account in my name, it's not me" and "I happen to now that G+ has certain rules, and I don't like them

That's not a contradiction. He says "someone signed up an account in my name, it's not me" and "I happen to now that G+ has certain rules, and I don't like them" and incidentally the rules prohibit someone from impersonating him on G+, but that doesn't mean the rules have perfect enforcement.