Whether you choose to emulate on a Steam Deck via PCSX2 or install OPL on your chunky gray PS2 from 2001, the process is the same:
This detailed write-up covers the methods, terminology, and best practices for installing PlayStation 2 ISOs onto a Hard Drive (HDD) for use with the internal network adapter or USB loading. ps2 archive iso install
This is the most popular way to play on original "Fat" PS2 consoles using a Network Adapter. Whether you choose to emulate on a Steam