Let him know that you think those anti-communist materials are wrong or misleading. Offer to explore some of these topics in depth with him in some format(s) that's agreeable to both of you (video, books, podcasts, whatever). Let him pick some sources, and you pick some sources, and then you both discuss them together.
Most people who are anti-communist are reflexively so, and have simply never heard a lot of key history. Just studying/exploring/discussing communism and its history can undo a lot of that.
As tempting as it might be, you don't have to go through everything in the propaganda they've sent you sentence by sentence and then debunk it. Just have a conversation with them about it and take a look at the real stuff together.
What year is that image from?