Is it beatable? Yes, technically. Doesn't mean that it's also not broken.
The main issue is that on the second phase, Hithrengor's Judgement and purple eyes are not properly telegraphed, necessitating the use of 3rd-party plugins (Gibberish or Prime) to track when he is going to use them. A boss fight should never REQUIRE the use of plugins to be beatable!
But that's not even the worst problem. Additionally, Gibberish's timer for the eyes will desync with the boss's timer for casting it more often than not since the extremely long channel of Judgement can delay the casting of the purple eyes that would have otherwise occurred during the channel. This makes the timing impossible to predict for casting debuffs such as champ taunt, LM power drain, and piercing roar in order to soften the damage from the eyes.
I would recommend making both Judgement and the purple eyes into grey induction skills, or simply nerfing their damage if that's too much work.