yeah gotta second how tedious this villain has become. Just a constant series of "ah ha! you thought he was dead but he is actually invincible in one more way now!" It feels like it's just going to end with somebody getting the page and just making it so he never existed or something underwhelming like that.
Also if his goal was to capture the armies with vampire bullshit, what was the point of targeting the detective agency? He was worried they'd stop him? Apparently this vampire infiltration had been happening for some time now and they had no counter or any evident awareness for that, and it would've been even easier to turn magneto over there if he weren't already suspicious of him.