Those respond when the user the bot is logged in as does a thing.
Not when other moderators do them.
timeout_success is sent in response to the user you are logged in as, sending the timeout command (if it was successful)
untimeout_success is sent in response to the user you are logged in as, sending the untimeout command (if it was successful)
Checking my own logs I do not see this being reported for not the user my bot is logged in as