Sorry you have to deal with that. I would mail them to him with a simple note that says something like "hope you are well."Good Morning!!! Happy Earthday!!!
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Since my parents retired they have gone from normal to exactly like your uncle in less than a year. It's amazing how destructive it is to mental health when you sit inside and force feed yourself content that fits into your narrow worldview. People like that choose to spend all their free time reinforcing their own biases and hatred toward others. It's not necessarily a new part of them but it gets worse when they do this to themselves.
My advice is just don't deal with it. You can love someone - from a distance - but you can't help them. When they are that radicalized they are a lost cause.