On one hand ... yes. On the other hand, itīs cool that theyīre giving a pseudo-biological explanation for how you activate SSJ. Just for the record, SSJ activation never made sense. Goku turned into SSJ on Namek because he got REALLY angry. But he got REALLY angry during old DB, too, when Kuririn was killed by one of Piccoloīs children.
Personally, I try to rationalize it that way that you have to truly BELIEVE that you can transform yourself into SSJ for it to work. When Goku first transformed into SSJ on Namek, he was angry, frustrated, and simply wanted to have the power to beat Freeze; therefore he manifested the SSJ. It was easier for everyone else, because they already KNEW that the SSJ transformation was real, so they were higher motivated to make it happen. Itīs similar to walking over smoldering coal - if you donīt know that it works, you wouldnīt even try. But after you see people doing it, you realize that it actually isnīt difficult.