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Unless this has been updated since 2018 (it doesn't have a date but also looks like it still from 2018) it should be marked [2018].

Also: Here is previous discussion from around the time this website was created: https://news.ycombinator.com/item?id=18180017

> Unless this has been updated since 2018

I think this might also apply to Flatpak.

Has Flatpak addressed any of these concerns? If so, how?

That's not how this works. Old content is marked with its year, irrespective of its relevance.