They only mined two blocks and never payout miners for mining on their pool.
So it's gone forever.
According to that post they mined 2 blocks in 3 months, however they go on to say that they were reputable previously so they potentially did payout before that 3 months or at least on blocks they mined prior. However, that thread is inconclusive, as it seems that the pool had issues even when it was operating with several users complaining about the owner.
It was bitcoinpool for sure . I have the emails still and I know the public address so I have been able to check and see the .75 BTC. It was quite easy at that time to mine.
You could read through the thread linked above, I've taken a quick look, but it doesn't seem like anything that would be useful to you is posted there. Unfortunately, it looks like you'll never retrieve those coins.
Their website, and forum is down. I doubt there's anyone left to contact. Seems the OP of
this, and
this thread was a part of Bitcoinpool. Might be worth giving them a message since they've been active as recently as of today.