Technically yes, but that’s a bit like saying rocket engine patents are about the vector of hot gasses. There are a lot of issues with creating one chip that both emits and receives light which are not present in a transmission model. In particular, if you look at the actual claims in the case, this is what many of the areas which were infringed upon deal with.
A rocket engine (in its entirety) is probably not something you'd patent, probably because of precisely this issue. A sensor that can detect light is also likely not patentable, even if how it does so is novel. That seems ridiculous to me; there needs to be a point at which a patent, no matter how novel, shouldn't be possible.