From the manual -

The PG Dynamics compressor is a downward compressor with make-up gain.
A downward compressor works by making loud signals softer. After loud passages have been made quieter by the
compressor, you can apply make-up gain to raise the final audio level.

If I recall, you are correct that the hard write Compressor is upwards.

From searching help and looking at the hard written effects section:
The RealBand compressor is an upward compressor. An upward compressor works by making quiet signals louder.

So you reached the correct conclusions

I do not work here, but the benefits are still awesome
Make your sound your own!