whoa, 426m! you solved a block! coooool

Nope.
The pool "solved" the block, not him.
What he did was to use a machine which generated the SHA-256 number for the pool to "solve" the block.
He would only had "solved" the block if he was solo "mining", what is not the case.
I don't get the distinction you are making here. It looks to me like he solved a block for the pool in exactly the same way he might have solved a block for himself if he had been solo mining.