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Just by the padding in the buttons it's obvious that twitter's current site was built for mobile. Sure, it's responsive, and i bet flash could become responsive if it was still alive. HTML games however are also non-responsive most of the time just due to the nature of their use case.

They might have meant mobile-first and not mobile only. Their desktop site is very clearly designed for mobile, the main content does not change at varying screen widths. The sidebar and header do a bit of restyling, but thats about it.

https://blog.twitter.com/en_us/topics/product/2019/introduci...

> The site has an updated look and feel that is more consistent with the Twitter you see on other devices