To be fair, GSP has said and continues to say some pretty strange things about aliens coming into his hotel room, and he's not renowned for getting hit in the face.
On a serious note, though, it can't be good for someone's health to get hit flush that many times. If you listen to Chuck Liddell or Stipe Miocic speak, both sound a little punch drunk, and there are obvious signs of some damage.
We all love MMA, but I don't like this side of it, and I wish that fighters who take that much damage try to think of a way to preclude that by either figuring out a way to change the way their fights play out, or by prioritising health over money and retiring while they're still coherent and relatively healthy.