Anything with a scripting engine isn't lightweight compared to (classic) Notepad!
(Also, a lot of that stuff comes bundled with Emacs out-of-the-box, further disqualifying it. Having a scripting engine is one thing, but having a scripting engine along with the whole rest of the jet is something else entirely!)
Notepad was just a wrapper around some default win32 controls. Judging alone by exe size is not right, although probably a “statically linked” notepad would still be smaller than emacs