UC Davis student here. To be fair, ECS10 is not a class that CS majors usually take--it's primarily an elective, and taken by non-majors as a way of satisfying science and engineering general elective credit. The CS majors start with ECS30, which uses C; ECS10 isn't even a required class for the Computer Science programs.

As for whether or not they are computer schools, that criterion was determined through USN&WR, as mentioned in the article, which is where your criticism of not being a computer school should lie. Davis is listed at #34 though, so there may be a sharp decline after the first 10, first 15, etc...