The issue with the first couple of planes is there were elements of the SDK that needed adding or improving, this took time, of which that hurdle seems to be past, with PMDG (as an example) saying there's no more blockers for them to release their products, so theoretically now we have the first planes like the CRJ, Twitter, close to the NG3, Fenix A320 etc, new planes will not meet the same issues and therefore take less time to create.
Plus mathijs said in December that the A330 was a few solid months from BETA, I really can't see a few months meaning a 2023 release especially at one point last year there was a chance of the first A330 releasing in late 2021