When I think SK Terran I think vessel cloud and mad dropship play. I'd maybe point to Iris's bio TvZ as a good "classic" example. Obviously there's room within SK Terran play for variation since it's kind of a basic concept - for instance, Leta's 2-port wraith into SK style - but I'm pretty sure it's not just another term for all bionic play (especially since, you know, Terrans went bio TvZ before Soul_Key). For instance, there's Flash's bio which can be more tank- (and sometimes goliath-)heavy especially in the later game, and fantasy's valkonic builds. They're both basically bionic styles, but not really SK.