Daas Yochid, who wrote that?
This whole issue has nothing to do with ROB, and I think it was actually an inappropriate thread to discuss this this it confuses the two topics.
To say that your Rebbe did not know about something uninvented in his time is fine. To say that you understand Torah better than your Rebbe is not.
If you have a Kasha because something sounds like it doesn’t add up, try to find or come up with a Terutz. If you can’t, try an Okimta. My own Okimta is that even if playing ball wasn’t literal Chillul Shabbos, they has major leagues on Shabbos, which is Mechallel the spirit of Shabbos and Yiddishkeit. The Rambam warns about Shabbos and Yom Tov not to turn it into a hang out day.