That is massive, especially considering this is roughly 1/3 of the game and we still don't have many options like all classes and origin characters.
I can't comment on whether or not it's an estimate for EA or full release, but what I can tell you is that the way most games work, is that assets (primarily textures and audio and other small but numerous files) takes up most of the space. A new class, including its skills, stats and coding for origin characters would be a matter of a few
megabytes total of storage space, if previous Larian games is anything to go by. The entirety of Reaper's Coast as a map in DOS2 was ~200MB. So the game content is actually very, very small in storage space. So growth of total storage space is not linear in parallel with growth of game content
