For DSSS demod, my guess is a 20 tap match filter designed from a resampled RRC filtered barker sequence. Haven’t looked at the VHDL, but that’s how I’d do it.
No one who really knows can say due to NDAs. We just know rough order of magnitude price.
I can see $30 million for 5nm. With material costs approaching $20 to $30 a chip for mobile SoCs, you need quite a high sales price and volume for the economics to work.