The excuse to just use the thread option is useless on windows since it doesn't support the threading with the pcntl forking model

And on windows - the 32 bit version of PHP is still in use in many places (sigh)

With the memory limit commented out, everything works fine.

Checks took 1.29 seconds and used 57.952MB of memory
Psalm was able to infer types for 86.760% of analyzed code (37 files)

If you're absolutely sure you need to police people - I'd recommend making the memory limit a command line option so people can override it without hacking code.