My local dealers (CA) don’t even show any Ultimates available to order, so I can’t see for myself. But whenever I’ve looked in the past, the Ultimate did have pilot assist. (In fact, I wanted Ultimate for this reason, but couldn’t get my hands on one, so was stuck with a Plus.)
And yes, Pilot Assist is different from lane assist, which comes on the Plus as well. The basic breakdown is:
Lane Assist: keeps you from veering out of the lane, but doesn’t keep you centered in the lane. Some find this annoying, since you have to fight it a little when changing lanes, but in my experience that goes away if you use your turn signal like a good citizen.
Pilot Assist: adaptive cruise control and more active lane following (though some have commented in these forums that it may hug one line rather than being centered).
I wouldn’t be surprised if they degraded what comes with the Ultimate because of the chip shortage. Hopefully the price is adjusted to reflect the missing feature, or you should just get the Plus instead.