There is a caveat here: in the case of a typical, single-phase synchronous AC motor connected to the mains supply (think lower-end Thorens, Rega, VPIs, AR, some Projects, etc) its speed is derived by the incoming mains frequency - 60Hz here in the US. If the mains frequency is say .25Hz low (59.75Hz), then your table will run slightly slow but you'll never know - as the light you are pointing at the strobe disc to derive speed accuracy is also running .25Hz low. Hell, the speed could be wandering all over the place, but with the table and the fluorescent light clocked to the same frequency, you'd never know!
Of course, this doesn't apply to Doug, as his deck uses a DC motor - many other folks use AC motors, but with some type of dedicated external supply (like an SDS, Lingo, SpeedBox etc) which (theoretically) ought to take care of such issues.
Of course if good enough is sufficient, so be it. Have a pleasant holiday season!