Yes, that used to be the case, now you need at least one passholder per room booked.
And to elaborate/clarify that just slightly, you must have as many Passholders as you have rooms booked. But you *don't* have to have one passholder in each room. As long as you can show that you have enough APs, you'll be OK.
For example: A couple years ago, I went to WDW with three friends. Two of us had APs, the other two didn't. We got two rooms under an AP discount. The way we ended up deciding to pair off and share room, I and the other Passholder were sharing a room. But because we had 2 rooms and 2 Passholders at check-in, everything was fine.
The only problem you might run into would be trying to book AP-discounted rooms online. You need to have an AP or AP voucher in order to log into the Passholder section of the website, and then I believe the Passholder would have to be one of the Guests registered in the room. So to get around that, it's easier to call on the phone to book.
This also brings up something I was recently wondering (even though it ended up beeing a moot point anyway...) I'm a Passholder. I'm going to WDW in June, and staying at Pop on a Free Dining PIN code. I have a couple friends who were thinking about going at the same time and getting their own room. When the AP rates came out, I calculated them out vs. the B4G3 offer.
B4G3 ended up being cheaper anyway, but I wonder if they'd be OK if my friend booked an AP rate, and *I* was the one showing my AP at check-in. There'd be only one room with an AP discount, because my reservation was on a Free Dining offer and not an AP discount.
-Rob