The wiki entry is based on Leap using shim-5.7. However, both Leap 15.5 and Leap 15.6RC are now using shim 5.8, and this fix does not work as well.
Yes, it will still reset as long as you only boot Tumbleweed. But if you ever boot Leap 15.5 or 15.6, the same problem will occur again, at least according to my tests.
To dual boot both Leap and Tumbleweed, you will need to disable secure-boot, or to always use the Leap shim for booting Tumbleweed.