He's had a string of posts pointing towards being a troll, but you never can tell.
If you've got a TV setup with a Nintendo switch, Sky Box, TV that automatically sits on standby, PS5 that usually ends up in rest mode, soundbar that people accidentally leave on, Sonos speaker, all connected to a power strip that goes through one of these, and you put it on a power schedule to turn off in the wee hours when you're not using it, the smart plug will draw less power than all those things on standby would've.