Here's a clip including both confirmations. (that I know of) A more direct one was from Meghan McCain that cannot simply be misspeaking.

https://rumble.com/v137257-meghan-mccain-and-john-kasich-you-cant-kill-him-again-john-mccain-was-put-t.html

The video also shows McCain with a boot on his left leg. Before his execution there was something odd. McCain originally had his boot on his right leg. The boot was moved to his left leg and he explained it by saying that he had to give his right leg "a break". This is very odd unless he was forced to wear an ankle monitor, he was using a boot to cover it, and they moved the ankle monitor from his right leg to his left leg.

https://thehill.com/blogs/blog-briefing-room/361682-mccain-explains-why-his-boot-was-on-a-different-foot/

The execution of McCain was one of the greatest Q proofs ever.

https://threadreaderapp.com/thread/1034544386665840641.html