They create a fake story about a new feature to promote the app. And then they work out how to create fake text messages. I don't like the approach they used. Get real users to provide a real testimonials instead.
If you can post fake messages today that promote your product and will start getting you users, why wait for real users to provide real testimonials that align with what you want to communicate to do the same thing 3 months from now?
Of course you want to seek out real testimonials from satisfied customers and share those as much as you can; you don't want to lock yourself in a bubble where you post how amazing your app is while emails of dissatisfied users pile up in your inbox; but it's not an OR situation, it's an AND situation.
You might also be surprised to hear that the family laughing together while drinking Coca Cola in those video ads isn't a real family, they're not really having fun, and they're not really enjoying Coca Cola for the sake of it - they're on a filming set in front of a green screen paid by the hour.
Commercials are on their face a work of fiction unless stated otherwise — for customer testimonials in commercials that are fake (in the US anyway) there has to be text saying as much. Because otherwise they’d be lying…
They are a staged conversation with a contact named "Speedometer FAQ" - not pretending like it's with a real person, or real customer testimonials.
If it makes you feel better, you could put "simulated text messages" at the bottom of such images.
It’s like saying “it’s ok to call the car ‘full self driving’ because one could figure out it’s not really full self driving.” But obviously, not everyone will realize that and you’re benefitting from the deception otherwise you wouldn’t have done it.