You most likely used a one-click install for TW, then ignoring the warnings about repo addition etc. But hey, as you found that can happen :).
In the output of
zyppper lr -d
the repos have index numbers. To remove the TW repo, get it’s index number, and replace I_N by that number
sudo zypper rr I_N
Then run zypper dup.
But, if your install is with btrfs, you should be able to rollback to a previous snapshot, and make the changes undone. That would be much easier and quicker.