That doesn't mean anything bud, open world games have a low percentage completion rate for their narrative campaign, 30 percent seems like industry average.
https://www.forbes.com/sites/insert...s-will-actually-finish-gta-5/?sh=748e2de166cc
Skyrim SE stands at 10 percent on steam.
Skyrim LE stands at 31 percent on steam.
The Witcher 3 at 26 percent on steam.
Fallout 4 at 31 percent on steam.
ELEX at 22 percent on steam.
-etc.
Cyberpunk is at 33 percent on GOG and it seems to be going up since the last time I've checked when it was at 28 percent a few weeks ago.
Now bare in mind that the game was just released and a lot of people stop playing the main quest before the point of no return to be able to play in the sandbox finishing up the side quests and waiting for patches.
Considering the shitstorm following the release that's quite a high percentage going by the fact that a large portion of the player base are touting that it's broken and unplayable.
In other words those numbers mean jack shit
.