Sure, that's what you'd attempt to address errors, but that still doesn't convince me. That only gets you so far. My intuition says that you won't be able to distill any meaningful results in practice across long distances and requests being routed to different backend servers under varying load. You are trying to isolate a very specific duration in the order of microseconds.

Of course, I'm not in the field and am happy to learn more. However, my intuition also tells me we should have seen more realistic experiments and results over the years to get a clear picture of the extent at which such an attack is actually feasible and when it seizes to be.