Thanks, I was wondering about the same thing, and yes that workaround does work.
I've always been listening to music via Airplay from my MBP to my ATV4 and this oddity has kept me from listening to Beats1.
Today, after applying the workaround, I listened to Beats1 for the first time ever. Some dude went on and on (without a note of actual music being payed) about making more money than my mom (who is retired). After ten minutes of patient endurance things didn't improve, neither musically nor lyrically.
Summing up, I cannot recommend taking the effort of implementing any workaround for listening to Beats1 via Airplay from a Mac to an ATV4. It just isn't worth the effort.