Thus his official terms of service on his web site are wrong ... or you are wrong.
Maybe slush should keep it up to date ... if he has time to and can afford to?
I've no idea which, but I obviously have no want or desire to have an account on slush or follow crap on facedesk.
Since his official terms of service say he is charging you 2% ...
https://mining.bitcoin.cz/terms-of-servicethen who knows ...
If you are correct and slush is wrong, then I'd be more worried about the fact that he effectively has no income supporting his pool according to your statement ... and we are heading for another BAN ... if he is forever charging no fees to anyone ever again.
Though of course your 0% fees since 1-Aug you are talking about, is less than 4 days of mining since however long way back when he finally dropped his fees to 2% ... and finishes when?

We digress, but yes, I am right and the info on the TOS is outdated, but more pertinent, you are wrong (as indeed anyone can be).
If you insist on sticking your head in the sand (even give the impression of doing so), thats your prerogative. Fact is, even before the demise of the fee on slush, actual payouts were better than kano.is expected (and actual) payouts.
Now that the fees on slush have been dropped AND merged mining NMC introduced, I am as sure as can be that payouts at slush will confortably exceed whatever kano.is can expect to payout, even with the supposed better luck that you claim for kano.is;
Your concerns as to how slush gets on without income are purely for anecdotal value as being the pioneer pool, I am confident they can get their numbers right.