It's a V3 bank and should import.
If you can export a bank and then import it now, then it to look like the import works.
But if you can't load a V3 bank, that have been imported by others, then i would say it could be a import bug in the application.
Do you have another third party bank saved with an earlier version of CS-80 V3, you can try to import?
Although I had to contact Arturia because I needed to add a patch and had problems. They actually sorted it and sent me the updated bank.
This you say about Arturia updating a bank, i find odd, if it was a V3 bank.