The TP-Link site has V1, V2, and V3 firmware...
So for OpenWRT purposes, you are matching the version (V2 to V2) the OEM GUI says it's currently running.
I found a difference in the header of the V2 binary for the link above, (which is the link in the RE220 Techdata wiki), and the V2 version under the release folder.
Try the RE220 V2 firmware here...
https://downloads.openwrt.org/releases/21.02.1/targets/ramips/mt76x8/