I believe this is correct. If I create a household routine in Google Home, I can select a switch turns on as a Starter, but I can’t then select that same device in the same routine as an Action, because it’s greyed out. It appears that Google Home does not allow self-referential routines of this type…
…except that it does: I don’t have a Wyze Switch, but I used a Plug Outdoor as a stand-in for testing and set up a Google Home household routine this way:
- Add starter > When a device does something > [selected my plug outlet here] > Turns on or off > Turns on > Add starter
- Add action > Try adding your own >
Turn off [my selected plug outlet] in 1 minute.> Done
When I went to save the routine, Google Home prompted me to select a device under Configuration, so I selected Don’t play media, because I don’t need to hear anything with this one. I think having a media device selected is a standard requirement when you “Try adding your own” actions.
The first time I tested the routine, it failed. Google Assistant (on my phone) gave me this message: “Sorry, because of potential risk to safety, I can’t schedule actions for devices configured as outlets.” 
Then I went into the device’s settings in Google Home and selected its Device type as Switch (Outlet) and tried again. Fail: “Sorry, because of potential risk to safety, I can’t schedule actions for devices configured as switches.”
Then I went into the device’s settings in Google Home and selected its Device type as Fan (Outlet) and tried again. Success! 
So it’s possible, but there are some caveats and hoops to jump through in order to get it to work. I think the simplest and most straightforward work-around I’ve seen so far is what @hanserikn suggested in another topic:
That has the added advantage of staying within the Wyze ecosystem.