No one is 100% honest in interviews like these, so everything he says should be taken through a media lens/with a grain of salt. Despite this he's mentioned having more injuries than the average skater, and his body not being able to hold up for very long doing all these quads. And seeing how he's the only skater AFAIK older than 20 years old adding quads every year, I can see why. The others don't even dare because they don't have Yuzu's passion nor his solid technique to try without potentially seriously getting injured. And even with Yuzu's pure technique, he still gets injured.
He says that if he competes in Beijing he'll want to win, which is very classic of him, but it also implies that if he can't win, then he won't compete. Yes Javi is 26 and competing at his 3rd Olympics but I don't think Yuzu would settle for a bronze medal after two golds. But I do believe him when he says he loves skating and doesn't want to retire (I can never doubt his passion for skating, lol), so I see him trying as hard as he can to heal and improve but when it comes to a time when he no longer can, he'll probably leave the sport at the top.