If the failing to load is happening due tot he mod, it's more likely that you have another mod on that's causing the problem because it depended on that race mod. Just the removal of a race mod will not cause that kind of problem, as it will just override the missing race to greenlander. Disabling that mod, whatever it is, should stop the issue.

It's also possible that the failing to load is something else. Zone data corruption is a somewhat common cause. I would test importing without buildings (no need to save after, it's just a test). Doing so clears all zone data, which will tell you if the problem was in the zone data.

If the import without buildings works, this guide has steps to track down and remove corrupted zone data. https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2789171241

No luck importing without buildings.
Making a new game, saving and loading said save, seemingly works fine, if that matters any.

Update: it showed up elsewhere on the internet, and using that version, the save works again.
Not sure what led to this chain of events for the mod but I hope the best for its creator.