You will never see an official LineageOS 20 (Android 13) build for this device. The chipset lacks proper open-source drivers (Caf/HALs). However, that does not mean there are zero options. The community has produced several stable ports that push this tablet far beyond its expiration date.
Finally, the message appeared:
Samsung Galaxy Tab A 7.0 (2016) , also known as the (codename: samsung galaxy tab a6 sm-t280 custom rom