Does the AT&T Tablet standalone plan still exist?

So I’m gonna get a new iPad, and I’m planning to get AT&T with it, since I wanna try out a new network (I use T-Mobile), And apparently, there’s a plan called the AT&T Tablet Standalone plan ($20/mo? Unlimited data, 22GB Premium data, and 10GB of hotspot) and apparently it may exist or it might not, I’ve heard stories of people getting it in AT&T stores, but it took many tries, thanks in advance!