I'd presumed that Watson refered to the assistant of Bell who first understood electric speech. Probably a wink to the quirky and confounding associations Jeapordy delights in.
I seriously doubt that this could be made to work, since General Relativity denies the very notion of simultinaity required to coordinate signals. And this results from two monkey wrenches - the various velocities and accelerations of the pulsars, and the varying and unknown distribution of gravitational fields between the objects. Space across galactic distances is not Euclidean, and the degree of curvature is not constant from one place to another on large scales.
Naturally, I didn't RTFA, but I'd be surprised if this scheme is valid even in principle. See sig.