It was more comparing the tweet to a similar last gen pre launch tweet which was equally missleading.
VRR is a special case and even when enabled at the system level needs per title activation I believe.
Outside of this the console can only run at 60 or 120 fps, this assumes they drop 50hz support as no hdmi (TV in). Games will fail to update the frame or take multiple frames to update but the TV and console are locked in that fps step which is seperate to to the games updates etc.
More commentary on the comedy than technical imsight I am afraid. For reference
Now
(me slightly putting words in his tweet to match prior form)
Then
Xbox outputs to the TV at 1080 if you set that (720p game controversy not fully understood by exec)