No, I think he searched for the ETA App and was disappointed at the lack of emphasis on an alternative to the app once you are in it. If you just search the web for ETA and gov.uk it takes you straight to the online portal (which also asks for feedback as it's a service in Beta). The gov.uk website is neutral between you using the app or the online portal.

The only point I can see here is that once you are in the app it keeps encouraging you to use it and doesn't keep suggesting you might like to use the online portal instead. But I don't understand the initial premise about not using app stores. If the author didn't want to use an app store, why did he download an app instead of going to gov.uk?