It's a bot run by this Japanese dude:

He runs a Discord server to preach his cult "The Old Path" and has multiple accounts with which he spams thousands of people. I've talked to him on Discord and told him to stop spamming my comment sections and he basically said that he didn't care if he was annoying me. He said that his goal was to reach as many people as possible regardless of the means used, and that he would continue to spam all comment sections as much as he liked.

So, you won't reach him by sending comments, or downvoting or anything. Just mute all of these accounts whenever they comment on your posts. That way these comments will be hidden and greyed out whenver they pop up.

edit: And no, he doesn't read your post, the comments are automated, sent to thousands of people every day from multiple accounts.