The reason I don't play that line against the Bowdler is that White can just ignore you and play normal moves and then you have to know what to do in the main-line Bowdler anyway. On Lichess 2000+ only 17% of people play the immediate e5. White also has a bunch of options around how to play the pawn advance, they can play e5 immediately, d3 and then e5, Nc3 and then e5, etc. These are all subtly different and go into structures I am unfamiliar with. Even if Black is somewhat better in these lines, I'd rather concentrate on learning the main lines.
There are a lot of traps in the main lines as well, for example:
Those are all the most popular White moves from people who play 3. Nc3 (and the trap also lands against 7. Nf3 and 7. f4). You do have to know the ins and outs of how to extract the knight from d1 and/or win their bishop in return (you can have a look in analysis) but I have had this on the board many times. Here are all the most popular White moves for people who play 3. Nf3:
I can land these sorts of things a lot and keep it simple without needing tons of extra lines on top of that.
He might not have been a strong player. It's thematic in similar positions, especially a variation of the Caro-Kann.
The player who made the video is a grandmaster. As i said, it is practically a very strong idea, but with proper play white is just throwing away a pawn.