unplayable = hard to enjoy . Or perhaps you love ARK port on Switch
Enjoyable is different than playable though
By words it's different, but a games that is not enjoyable could also be read as unplayable to some. For me if i am making a Youtube video to a lot of viewers i will be more savely choosing my words to not insult some viewers and readers. Digital foundry words is just choosing different words.
Also the video also explained latter on how the games will be unstable and hard to maintain frame rates , if this does not show how bad the performance test is i don't know how to explain to you anymore.
And then you mention the games can be playable at 20 to 25 fps. I guess playable in your opinion is different from playable in Digital foundry opinion and mind, games like ARK survival evolved sitting at the same frame rates and resolution that you mentioned and many people complain is unplayable, but i guess your standard is different.
We can agree and not agree. But i do respect your standard, if you can enjoy games in 20 to 25 fps , than you may have right to claim is playable.