Come on Andrew, you're an intelligent guy.
There's a huge difference between a buy & hold strategy long term on a well diversified portfolio, versus share picking, whether long or short positions, with a shorter term view. The risk is at the other end of the scale.
You're comparing this to a conversation about a 20+ year horizon.
My point was, Tesla would likely be part of a well diversified strategy. However, on a standalone basis the opinion is it can only decrease in value, in my opinion Brendan is mixing concepts to support his views with no evidence to support.