Uh, i think i read your initial question incorrectly at first. So, turning off detect sounds, will prevent it from recording event videos based on sound, alternatively you can leave it on if you want sound events, and just turn off the notifications. For the smoke alarm detection, I have it on, Sound detection off in event videos and advanced settings so the camera records not sound.
Also to speak to the reliability of the smoke alarm detection, we unfortunately have very sensitive smoke alarms in my house (very, very annoying) and they go off at least twice a week, even when theres no smoke, lol. My Wyze camera is in the same room as a smoke alarm, has only detected the alarm once. The alarms are incredibly loud because my whole house is on a system so everyone of them goes off if on is tripped.