I end up fixing the driver to make the device useful to me and pushed a PR: https://github.com/sky-nie/hubitat/pull/1 @susam0912 would you mind to take a look?
For anyone who is having the same problem, here is the driver code that works for me:
https://raw.githubusercontent.com/kennethxu/sky-nie-hubitat/main/minoston-power-switch.src/minoston-power-switch.groovy
