Although I have not used a Teslatap, it should work on a Taycan -- as far as I know, the Teslatap itself merely acts as a conduit, just an adapter, to connect the Tesla destination charger to the J1772 inlet on a Taycan.
I would like to read if someone has tried it though, just to confirm that the Taycan will not reject a Teslatap. If we read reports that it works on a Taycan, I'd buy one to keep handy for trips to resorts and the like that have Tesla destination chargers. Sometimes I visit the Ritz Carlton Dove Mountain (in the foothills above Tucson) and they have Tesla destination chargers. Their location is remote enough that it would be convenient to have the valet charge the car using a Teslatap while I'm staying there.
I may get one just to have handy even at home. I have two Tesla wall connectors but only one for the Taycan.
Just remember they won’t work at a supercharging station (L3). Only L2/destination chargers.