Are you sure that app is native? Sounds more like a PWA and since they have a Service Worker [1] I am convinced that what you are seeing is not a 'native' app, but if it feels like one thats just fine :D

From a desktop user perspective (1920x1080) I think the font-size would be better readable at about 60%.

[1]: https://resilientwebdesign.com/serviceworker.js