I've never bought corals online (nothing against it just haven't done it so far fish either), but generalization to keep it mind. There is zero chance any coral that's shipped will look as good as it does on pictures specifically sps - acros and the like. Shipping stresses them out so expect things to take time to get colored back up if they ever do.
Some places definitely use basic filters to adjust photos. While some sleezy places will out right edit the photos adding colors. As with anything if it looks to good to be true it probably is. Likewise if something looks epic for a cheaper price than expected red flags should be going off.
This is nothing directed at the seller you mentioned fyi. Just general things to keep in mind. Shipped corals won't always match the before pictures. Even if you get something from a lfs drive it home it may not look the same in your system as the orginal system after a few days. There are to many varriants from one system to another. With that said best to have rational expectations and don't break the bank on some ultra insane looking coral online, thinking it will look that way when you get it.