To be fair, most people CANNOT get that sort of a deal.
You have put in dozens of hours of your time (if not more), you have applied for a specific card, you qualified for specific rebates requiring having an existing lease (so someone with no knowledge and experience of leasing would never qualify for this price), required a Costco membership (what if only Sams Club services a given locale?)
On top of all of this, you already leased a Bolt (for more money) and rolled up to the dealer driving one. 95% of people shopping for a Chevy Bolt lease are not already driving a Chevy Bolt when they arrive at the dealer. This, IMO, is the biggest thing that changes the air when you’re trying to score one of these unicorn EV deals.
It’s not that what you accomplished is a myth; it’s just not repeatable for most people. You went into this with such a specific set of circumstances, qualifications, understanding, an existing Chevy Bolt lease, and a bottle of whiskey. The people you’re fighting with on the comments section of Jalopnik are never going to bother trying to align all those stars. To them, your deal is impossible to achieve.
It takes a dedicated person with the right social skills, plus all the other qualifications above, to pull off your deal. You’re clearly that person, but a lot of the people that lurk online are not. It’s not too hard to see why they can’t fathom your deal as possible from their position.