I know you're not around here as much, but
@usctrojancpa made the call that Irvine would outperform inflation, even buying at the peak, so that is why we measure in real terms. When inflation was 0-1% it didn't matter much whether we measured in real terms or nominal, but with 70's style inflation roaring back it matters a lot now.
Secondly, the gold standard around here is to measure in PPSF, and unfortunately Zillow uses the "Zillow Price Index" which nobody trusts.
Lastly, since Irvine is full of cash buyers it makes sense to measure prices in real terms, because if their purchases are lagging inflation then they are losing money (not even accounting for the higher costs of taxes, mello, insurance, and HOA fees in Irvine).