I'll guess ...
(A) This is his first post (at least under this account)
(B) He has a PS+ subscription, or PS+ just sounds like a cool place to post
(C) PS+ is a sub-board under Network; maybe he got dazed and confused
(D) Honest mistake
(E) Pure ignorance; see (D) above
Oh, that was a rhetorical question. Sorry ... but not too sorry to get my morning off to a dog, diggity, dog day.