I do understand your frustration.
The Flipper is also advertised as Educational Tool. Education is not ‘I want to open this specific gate’. It is more a understanding of how these are working and also why I can’t open this one.
If you are owning the gate, you are allowed to play around.
But nobody would tell me in a public forum how to short wire (without Flipper) my Skoda Octavia even if I own it. Luckily I am a learned car mechanic and know how I can do this or why I can’t in this specific case.
Shortly I saw an ad about a game where kids learn how to break into a bank. ‘Code cracker’ or something like this, where up to 4 people sit around a board and try to crack the code by rolling dice for a virtually bank. So should we sue the company for not teaching is how to break onto the bank as false advertising?
I doubt the flipper advertised to work at your specific parking lot. There was just one example in the video and I would not want to park my car there.
Instead to be frustrated about what you want but can’t do, try to be happy that your car is at a safe place, that gets money to protect your car, and not everyone with a 200$ Multitool can in or out.