I see, and that at least does make a certain amount of sense. By putting timekeeping into the same category as any other measurement regime you would expect to

I see, and that at least does make a certain amount of sense. By putting timekeeping into the same category as any other measurement regime you would expect to see this kind of measurement difficulty emerging. What I'm not clear on though, is whether they're saying this is a fundamental uncertainty, or a measurement problem. The latter seems likely, the former a lot less likely.