There are very few priests that even know how to say the Mass in Latin. They never learned...and have a minuscule knowledge of the language.
It’s never too late to learn. Ask any musician. We learn new stuff constantly.
I believe at least four if not six years of Latin are now required in seminaries.
The younger priests coming out of the seminaries know Latin! Hooray.
In fact, last year in our Archdiocese we had one young man ordained in the Latin rite and the Maronite rite, so he had multiple languages there.
Besides, probably 85 or 90 percent of the Mass never changes, so repetition alone will teach it.
Obviously TV watchers had a front row seat and excellent sound quality, but I was amazed at how much I did understand. I even figured out which Gospel passage was being read before Fr. Z started his translation -- of course, when you hear "Venit autem Iesus in partes Caesareae Philippi" it's a dead giveaway!