Yeah, what I think is going on is that "here's how to be a non-toxic male" sort of thing that they push. Their worldview is, to be an acceptable man, you have to broadcast in obvious ways your "harmless" and castrated nature. Any voice modulation would confuse that message they're trying to get across. If it sounds alien and you can't pick up on the "gentleness" of him due the inhuman sound, then that message gets lost. The MESSAGE™ always comes first. They knew if they gave him a feminine or gay voice it would be too obvious and audiences would walk out. So they think "how do we make his voice kind of deep but still make him the "type of male we want men to consider acceptable", so the other deep sort of voice is like "whatever, you do you, YOLO, Imma just gonna smoke a bowl and, chill, watch some anime, and show my support for trans lives on Reddit every now and then". Like a Seth Rogan type in other words.

So voice modulated loses the point they want to push and feminine or high pitched makes it too obvious, so just semi bass tone voice (but with no edge or grit like Josh Brolin, James Earl Jones, Tony Todd, etc), somewhere around the Seth Rogen register to signal that if you're a "live and let's live" sort of "trans people are cool by me cause I'm just like chill and whatnot and got my weed", then you're a "good man". Any sort of voice that would sound "assertive" or "argumentative" aka non-feminine gets the axe.

But yes, it is hilariously bad. I've never seen that Orcs with normal voices, that's hilarious.