I do not know enough about Queen's later autographs to tell if this is real. It may well be but I don't trust the auctioneer on pop and rock. If it is real I assume the group signed quite a few of this particular publicity photo. It certainly doesn't look very spontaneous.
Genuine if it's not a reprint. I say that because a very common thing on ebay right now seems to be reprinting genuine signed photos. I'd ask for more detailed photos to check intentions for pen pressure. This was signed with a ball point pen so being on photo paper, one would be able to see a light indenting when the item is held a certain way in the light. Makes it safer to say it's no reprint. Nice piece. And no, the band didn't sign many of this specific promo photo.