The problem is that they aren't telling you what % of the block's BTC they are keeping coz it's PPS.
On my pool it's 0.9% of total BTC that comes in - 99.1% of all incoming BTC goes back to miners - way more then them - (though it's 100% at the moment til the end of the year)

On a PPS pool they'd have to actually tell you what they are keeping and giving out over a month to determine what % they are keeping.
It will be higher than 0.9% and extremely likely many times higher.

All PPS pools like to provide ambiguous information about their payouts - yes they all do - so that people don't realise how high the fees really are.