This is probably the case. DAZN took over NFL streaming in Canada and for the first two years seemed to use their existing European soccer processing chain (they might still --- I gave it a try to years straight and then gave up). So the 60/30 NFL stream was re-encoded to 25/50, and then on playback on my set would be displayed at 30/60. It was brutal, and even if displayed at 25 or 50 FPS was still brutal because they were seriously corrupting the NFL stream.
I tried it across a number of devices -- AppleTV, Chromecast, different TVs, pads, laptops -- and it was just unbelievably intolerable to me. Every panning pass was the horrendous juddering mess. Yet somehow no one seemed to have a problem with this! In discussions it seemed to be a non-issue.
Also, most high-end TVs are able to recover the original 24p (or other) frame rate and thus remove the judder by using specific settings: https://www.rtings.com/tv/reviews/lg/c9-oled/settings#judder
I tested with a high-speed camera that with correct settings my old Samsung UE75H6475 was able to recover the original frame rate perfectly from quite a few framerate mangling combinations. Haven't done similar testing with my current C9, though.