I'm sure nobody here has purchased from that seller so you'll have to let us know (and the name is likely something he made up or translated from another language), but the colors remind me of a guava I bought from TopTropicals years ago that they called "Sweet Kiss". It ripens light green on the outside and red on the inside, is nearly seedless though not entirely, is pretty small, and is really delicious. I like it even better than Ruby Supreme; its flavor is similar to RS but with more of a berry flavor.
Anyway, if you ever get fruit out of it, you should post here and let us know what it's like.