The article explains how they pretty much have to do it for legal reasons. Similar to microwave warnings. It has nothing to do with keeping the rightful owner from doing what they want with their car. The company does not benefit, judging by what the article explains, apart from having the legal disclaimer in case somebody who has no business (because of lack of knowledge) touching battery or electric parts gets hurt.
In a fuel powered vehicle touching fuel related parts at most gets you dirty. Even touching fuel does not hurt you. Electricity is different. Merely touching the wrong part can hurt you. Guess who would get sued if that happened and the company did nothing or even just not enough to prevent it.
While fuel powered cars can have sharp, moving (or rotating) or even very hot parts, all of those can be seen or sensed. Electricity cannot be detected by human senses, so here too is more reason to prevent access.
In a fuel powered vehicle touching fuel related parts at most gets you dirty. Even touching fuel does not hurt you. Electricity is different. Merely touching the wrong part can hurt you. Guess who would get sued if that happened and the company did nothing or even just not enough to prevent it.
While fuel powered cars can have sharp, moving (or rotating) or even very hot parts, all of those can be seen or sensed. Electricity cannot be detected by human senses, so here too is more reason to prevent access.