> the price of PPC processors is rediculous considering their limitations.

The reported supply and price issues are a reality for electronic parts in general, not just processors, or even just Power(PC) processors (see also the related problems of the PowerPC notebook project).
An additional issue for A-Eon might be NXP's March 2021 notification on last buy for P1022 and P5040 in September 2021, with last delivery in December 2023:

https://www.nxp.com/pcn/202102034DN
https://www.nxp.com/pcn/202102034DNU01

We know A-Eon had secured one thousand P1022 CPUs years ago, but what about the P5040?

(Btw, P5020 was already last buy in March 2020 and last delivery in September 2020.)

Of course, as was the case with the PA6T, chip brokers usually stock quantities of discontinued parts for much longer time (but often at even higher prices).