This has 3 big problems that make it a poor substitute for the Joel Test: there's way too many questions, some of the questions don't have a universally accepted "good" answer, and questions have too much ambiguity and wiggle-room.

One nice factor of the Joel Test (not that I saw it being used in reality - but as a mental model anyways), was that you could easily categorize companies into places you want to work or places you don't want to work. A perfect score? You want to work there. More than 2 things they don't do? You don't want to work there. 1 thing? Maybe look into it and see how important it is to you.

With this, your scores could be all over the map. What's more, the questions a company misses on might be ones that aren't that important to you (having a library), or even where a 'no' might be preferable to you (daily stand-up).

Even once you get past all that, many questions aren't easily answered objectively. What's a short iteration? I've worked in places that touted 2 weeks as a remarkably short iteration, and others who bemoaned how long that was.