The first number, "33" is the pin number of the CHIP Pro, "CSID4-SDC2-CMD" are the functions, and "PE8" is the actual pin name from the GR8 module. The key on that diagram is confusing.
Thanks for explaining.
(and thanks for agreeing that it is 'slightly' confusing)
It's actually quite sensible to encode the function multiplexing information into the pin name.