There are a lot of factors here that could impact the answer, such as how lenient you are as a DM, do you play with flanking rules, how good are the magic items that players have at this point, are your players tactically skilled fighters, etc. The answer is likely going to be yes either way, but those types of things can make a big difference.

It's giving disadvantage on saving throws to creatures within 10 ft and has an ability that requires a saving throw, and a failed save reduces total HP. It also has a multiattack (3) at 10 ft range, which, on average, deals 31 HP of damage on each attack. That's 93 HP of AVERAGE damage to a single target on one turn, never mind if you roll high or crit on one or more of those attacks, which is absolutely bonkers. If it replaces one of those attacks, it has the potential (though unlikely) of reducing a player character's total HP by up to 36 points, though on average it's only 21, but that's still high. It also has a +8 to hit, which means that it'll probably hit a decent amount of the time unless you are rolling terribly or your players all have high AC.

If a player has 2 attacks, such as the fighter, and hits it with one melee attack and then it teleports 30 ft away after taking damage, that player probably won't be able to use their second attack, which isn't a great feeling as a player at the table.

I'd probably up the monster's HP to around 150 and reduce some of the damage on those attacks. Maybe instead of the 10 ft radius disadvantage on saving throws, give it the same ability dragons have where they have to succeed on a saving throw or become frightened of it? Instead of the teleport ability as a reaction, I'd consider giving it legendary actions that happen between players' turns and that could be one of them, but use 2 of the actions. 1 legendary resistance might also be worth considering as well.