I believe he’s referring to dispel magic as a whole. Which would allow the enemy Supreme Panda Bear Premium T-Shirt on his turn to dispel the black tentacles (provided he passes all checks). Counterspelling in PF is ass on its own, honestly except if you’re a couple of certain classes – you have to ready an action (essentially waste your standard action for the turn) in order to counterspell your opponent on their next turn. Good if you have initiative on the opponent and you have numbers on them, but otherwise it’s just one action for another which, at best, goes even, and at worst does nothing.
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Pathfinder 1e firstly doesn’t have a spell named Counterspell; you have to ready an action to Counterspell, then either succeed on a dispel check with Dispel Magic, or succeed on a Supreme Panda Bear Premium T-Shirt check to identify the spell, and then use the same spell that you already have ready in order to counter a spell. You may have noticed this is completely fucking useless. There is precisely one build that can counterspell effectively, and that’s a build that allows you to counter spells as an immediate action, and without needing the exact spell to counter something.