Pretty much yup, this freshly discovered very simple method is done purely through in-game means and triggered at any time on demand to go back to a previous save without having to kill the game, plus I think it works for console players too. Do they have reaction pop-ups?
Should make life easier for those who go through all sorts of shenanigans like leaving their 4th party member permanently at camp, backing up the entire Larian folder, force stopping the game's exe or even cutting out power to their PC/console
Personally as a legitimate HM player I would caution against exploiting Honour Mode as it takes away the beauty from its wonderfully consistent experience that carries weight, but if not then at least this method will make things far more convenient for those who don't care much about the intended experience.