It’s so much worse than that.
You (@crilglay) are actually typing <..> for the arguments instead of just the argument itself.
It should be
protonhax run 999020 …
not
protonhax run <999020> …
I guess it’s your very first time using the command line.
edit: for future reference, <..> is a common notational convention to mean “replace by your argument”, and [..] means “replace by your OPTIONAL argument”.