The fact is we (you and I) don't know what the Android phone's behavior is when plugged in 24/7 (note the author is a community mod for an Android-compatible OS

The fact is we (you and I) don't know what the Android phone's behavior is when plugged in 24/7 (note the author is a community mod for an Android-compatible OS). The UI can/does lie, and it's probably different from model to model, so at best we can say we're not sure if he's right or not. Technically using DC power instead of battery is best for battery health (dis/charge cycles are worse for battery health) but like I said before, it's just a snarky suggestion on his part.