I mean, a complete 180° of the character because it supposedly is a thing that happens is interesting...but the fact we've only seen it with Ameri so far before it is applied to Iruma himself is weird. Even more so when the translations haven't made it clear it was a thing.
But still. Cool evil Iruma. I'd enjoy this so long as they do it periodically. Like, "The adventures of Evil Iruma" from time to time (1 chapter or a pair for some short story about what he does on that particular occasion), and sometimes actually give him a big arc to do some stuff. I'm sure that'd be a lot of fun.