With a response like that I'm guessing you're even more apprehensive. What makes it worse is that the photo is so severely altered that you'll never know what color the anemone actually is unless you order it and see it for yourself. I'd personally pass and look for another vendor.
Aside from possibly being a minimaxi or mertensii (and admittedly it does look more like a haddoni or gigantea in that photo), it could also be a Stichodactyla helianthus (aka Haitian carpet, Caribbean Sun Anemone, or Atlantic Carpet Anemone). Though it's from the same family as haddoni and gigantea, it's not a hosting species and could possibly eat clownfish.