'A kind of radar' does not mean 'kind of like radar,' the same way that 'a kind of animal' does not mean 'kind of like an animal.' This distinction, overlooked by yourself, becomes quite important when we're dealing with things like mechanical bulls, which may be 'kind of like animals' but are in no way, shape, or form 'a kind of animal,' because they ain't, or when we're dealing with flying cars, which may be 'kind of like not flying cars' but are definitely not 'a kind of not flying cars,' because they ain't, or when we're dealing with FTL sensors, which may be 'kind of like radar' but are pretty damn far from 'a kind of radar,' because they do not function like actual radar! Guess what, Lidar, which you brought up as another example of 'a kind of radar,'
also uses reflected light to function! All forms of transport (n.) transport (v.), all forms of radio use radio waves, and all forms of radar use reflected light! Now, the author could have chosen not to say 'a kind of radar.' S/he could have instead said 'kind of like radar' or better yet not compared it to radar at all, but the fact is that the author chose very deliberately to say that the spydeck uses 'a kind of radar.'