You'll be safer to wait until one of OpenWrt developers/contributors can comment.
Whether it is a typo regarding version 3.0 or whether 3.2 is not supported.
Unless someone already has direct experience with your router.
Hi - I would stay off the C6 topics. The A6 is similar but different, and firmware can be extremely specific, right down to the flash layout. The A6 topics and this topic are more likely to give you an answer.
I can’t add anything more other than to say that the device page claims you can install directly from the TP Link UI. You may want to try 21.02.x which is the release that first added support.