OP, Your dad has willfully chosen to keep the blinders on. The MSM narratives are constantly changing. The narratives don't make sense and the changing narratives contradict themselves. If he has chosen to ignore all the illogical arguments and inconsistencies, it is because he wants to keep his bubble intact. At this point in his life, he cannot psychologically or emotionally allow any information in that will shatter that bubble. He will disregard anything you try to show him that goes against what he wants to believe to be true. If you alienate him by trying too hard to shatter his bubble before he is ready, he will hate and resent you for being the one to do the shattering.

At this point, there is nothing you can do but be patient and kind and try to focus on the things that you agree upon so that there is a high level of trust and mutual respect. The day will come when his bubble is shattered and he will need your help to pick up the pieces, and he will not turn to you if you haven't built the trust relationship.

You can give some gentle hints, though. Optimun85's suggestion was good, but only in the right context. For example, if he brings up the latest news on the injection, you can say something like "Oh, I thought the narrative was X, but they just changed it to Y, huh? The narrative changes so often that I can't keep up!" Like I said, provide subtle and gentle hints when he says something to indicate he may be willing to hear your words and not block them out.