That is weird, this says Darwin Arm64 and in the other instance where someone is running an M1 chip, PlatformIO declares it as darwin_x86_x64 (possibly through emulation) at Platform IDE for VSCode on Mac ARM/M1? - #21 by tecnico-solar-boat.
@ivankravets the Xtensa32 8.4.0 version seems to be missing / not yet declared compatible with darwin_arm64?