The M-spec NUR (Silver car) may not have sold. Sometimes ads get taken down because they become stale after a while and so sometimes they resurface or finance falls over etc.. so just because it's placed on hold doesn't mean it's actually sold.
With regard to GTRs I've noticed quite a few cars listed have had recent price drops. Sydney lockdown and other states etc.. must be having some kind of impact on people's finances and without JobKeeper/JobSeeker and early access to Super like last year I'd say stimulus money is somewhat running dry...
However access to home equity to buy shiny things may still be a thing for some... I must admit I contemplated it momentarily, but decided perhaps not a good idea. I feel R34 prices may have topped out for a while , but I thought that about house prices 10 years ago.. egg on my face.