The markets in the put call parity are just too tight to be out of line. Its not really being arb'd its just that the market has become so efficient.
I was speaking generically -- through P/C parity which is artifact of R/C markets. I realize it's not a replication issue nor actual prints on R/C arbitrage.
OP , I hope you didn't got hurt a lot on this trade. As I stated few times before , RV is totally unreliable and it's not easy to find an alpha scalping (long) trade based on RV/IV lead/lag relationship. This week's price action is a perfect example. That's why I personally scalp cyclical vols only.
I opened the position Monday, long 30 qqqq oct 52 puts @ 1.45, I rebalanced every 100 deltas. My FIFO P/L on the qqqq's is 204.27, MTM P/L on the qqqq's is (367.00), MTM P/L on the puts is 730.27. Therefore, I am up $567.54 on an initial outlay of $4350.00. Risk was obviously only a small fraction of the initial cost. Thank God for path dependence, (and unbundled commissions) Thanks for asking..............Tone