Tecnifibre are making some very very solid frames, one of the best out there nowadays! They claim they dont make prostocks, and that their pro's only customize the actual frames made for sale. Medvedev is supposed to be using the same TFight 305 Dynacore that was up for sale back then, just w the current pj. Kasatkina is supposed to use also a TFight 300, pj as a TRebound.
Then again, who knows! The thing I've heard from Tecnifibre inside ppl is that they're very proud of their stuff and they dont play the pj game for other brands. It was true w Verdasco when he first was bought out of Tecnifibre: he wanted himself to buy his frames from Tecnifibre, and have them painted by his new brand (Head?) and they would play that way....