Not if you dodge.
That boss has EXTREMELY noticeable tells for both of his dangerous abilities. All you have to do is dodge when he's rearing up on his hind legs. Obviously the timing is a bit more precise than that, but it's extremely obvious to know when he's about to use that ability.
I soloed this guy with a Greatsword/Mace+Shield Guardian at the end of BWE3, when everybody was distracted by the beta's ending event. It's not that hard, just takes quick reflexes.