Giving Elon too much credit there. He asked a professional baseball player friend to throw the pitch. There's no way Elon could throw a pitch fast enough to break the window, probably why he thought it was bulletproof in the first place.
Unless I'm not misinterpreting, it was the chief designer who 'threw' (lightly lobbed) a metal ball at the window when it shattered.
They did later throw a 'baseball' at it that very suspiciously bounced unlike any baseball I've ever seen. Surprise surprise the tennis ball painted like a baseball didn't break it 😅
I legit feel this was part of his design philosophy, to get some sweet sweet government money for a new lav. EU said they were going all electric by whenever the fuck. Man saw an opportunity and thanked it.