PPLNS scam in long round and short round after long round (when PPLNS shares came back to 100% actual share in several rounds  but luck doesn't back to 100% in several rounds then stuck again )
If he correct, why he doesn't change to PPS because PPLNS (Pool stole hashrate or not) is lower 20-30% to PPS

You got scam, suprnova pool uses PPLNS to scam in long rounds, suprnova pool will switch user hashrate to another anonimous Zcash address and no found new blocks, then if you dont mine to finish in long rounds or you mine 50% in long round, you lost 100% shares in long round (3-4 hours)and earning in next short rounds (5-15 minutes) (15 minutes but earning ~ 30-40% earning long rounds) (he said "last 10 rounds" is scam). Many scam long rounds stuck 5->12 hours/day  with 300%-400% bad luck in days  and he will modify " Bad Luck" from 12x,13x% to 100% in next 1,2 days
Zcash mining in suprnova(7 days 100% luck ) is lower 20%,30% to another PPLNS pool
Stay away from this scam pool
https://forum.z.cash/t/suprnovas-zcash-pool-zec-suprnova-cc/2098/1963