Aiptasias are big pest anemones that sting and kill other corals and even fish. Shame on someone for trying to sell them to you as corals!
The rest of the pictures are actually corals though, and do look good.
I don't think he was trying to sell them to us as coral. He said that the tank needs some TLC and I think he was showing us what he meant. We just looked at it and thought it was a type of coral. lol