Well you can hear from his voice it's similar to when people have mild flu. I don't even know why you're making such a big deal out of this, I would understand if he was trying to hide his COVID infection but he didn't so it's to be expected he doesn't sound or look normal.
Does it sound like a reference to us at 0:51-1:01
"And I'm fighting for them, not just in the USA but all over the world. We are going to beat this corona virus and we are going to beat it soundly"
Replace "Corona virus" with cabal and you get yet another warning he is not backing down and the whole world(not their corrupt leaders with the exception of few countries) are with him.