Maybe his account is not true premium as tied to old GM account. I had a few months last year. Quite pleasant compare to usual "naked" YT. But nowhere as good as vanced and then revanced, UBO, VPN+Adguard, pi-hole, and tonnes of fake Google account created from all over the world and outsourced the passworded access to 3rd world to be abused so to confuse Google algorithm. Since using all these to thwart Google tracking and ads, I stopped YT premium after 3rd months as really no point I can do better than their premium service - and cheaper too. I thought premium frees up my time to tinker but they still track and occasionally ads do get thru.