Don't look like all T parts to me.
No not all Model T, lots of others and I sure would not pay that much for what they show in the photos. Most of it looks beat up with lots of redundant parts that are hard to sell anyway. That's why the are probable trying to sell a lot.
More pictures would be nice. I bought a pile like this awhile back for about half the money, but it came with enough parts I could probably make most of a chassis. Looks to me like they don't have that there.
Eclectic mix. Over blown prices. The norm for hemmings.