I think the best way to think of the Meat Seam is to think of it like a rpg boss fight in early Final Fantasy game, sure it have lot of health, but if you just keep on attacking the boss with your spell and weapon, it will go down eventurally.
You can definitely use that mindset to kill it, as long as it runs out of summons.
It summon isn't that powerful, maybe for early invesitgators.
