I'm not sure why the stat is nitpicked that much. Of course you can completely fake this stat. I have no idea if Stripe does or how much LoC or actual functional changes these deployments do. It's just that they are very confident in shipping changes, all with minimum downtime. Constantly, every day. For a company which does a major part of the financial infrastructure of the web, that's impressive.
In my opinion the goal isn't getting to some arbitrary number, it's making this possible. That there are no process/technical/cultural impediments not allowing you to do changes every single day.