EG, a specific Tesla shop can be stuck with bad management too.
A Canadian banks was caught because tellers were signing people up, unaware, with free credit cards, over draft protection, monthly plans, and even lines of credit. Why?
Management tying performance and promotion, and even job security, with overly aggressive conversion numbers.
So, even a Tesla shop may try an upsale, to get monthly profit numbers up.
In terms of the hack? It's not a hack. It is a simple, sensible fix. Bear in mind, the Tesla shop he went to? Seems to be little more than a component swapping repair site. They likely know little about car repair.
One other thing. You get good at car repair, when you work on 10, 20, 30 year old cars.
Fixing new, in lease cars is easy by comparison. Tesla has little experience with 20 year old wear and tear fixes...
Yet independent shops and experienced mechanics do.
Whereas, looking at it the other way around, an order of magnitude more expensive on the part of the manufacturer unfortunately doesn't look too bad to be true at all.
This seems like an incredibly wild assumption. The German concept of 'keine ehrfurcht fur deine maschine' will keep you from seeing every problem as a chance for your box to shine.
But we're talking about a 40k$ car and a system which is critical for cooling a part that is very eager to start a fire. I can easily imagine that the higher pressure or temperature tolerance would be needed if you're using the car in extremely hot weather (which can be a bit unexpected [0]) or when the battery experiences a critical failure. When working with systems that can have very bad failures, a bit of Ehrfurcht might be appropriate.
[0] https://www.theguardian.com/weather/2021/jul/08/weatherwatch...
Unfortunately, there are just as much of them just trying to get your money and then fixing it the simplest and cheapest way possible, without the consideration for long term safety and secondary effects that Tesla has probably put in.
As an outsider, it's hard to tell the difference, but I agree with the grandparent that an order of magnitude cheaper does look too good to be true at first.