The checklists for the Topps Vault sets are all in-progress and we add cards as we get notified about them, so that explains why the 2021 checklist is so small. I'll get your card added there and update this post in a bit. If you run into any other missing cards, please report them by clicking the "See any inaccuracies? Click here to let us know" link further down on the left side of a checklist's page.
Update: added for you here. I've also submitted release notes that say pretty much what I said above.