Yes, technically there is drag that will vary but practically I would not worry about it if speed is set properly with a quality table like yours that appears to have a massive platter. The drive mechanism combined with inertia of a heavy platter rotating should make any variable stylus drag effects insignificant practically I would expect.
If it does not sound good or good enough for some reason, I would look for a problem elsewhere before worrying at all about this. If it sounds good enough to you, then just enjoy and don't sweat any details that do not matter.
Also a good point above to make sure that the record itself is not the culprit with a speed variation issue. Try looking head on at the cart as it tracks near the outer edge and try to detect any cyclical lateral motion as the record spins. That is the indicator of an off-center cut record that will likely produce speed/pitch/other sonic variations as it rotates that may or may not be audible depending.
TO eliminate all nasty potential snafus with vinyl playback, which was invented over a century ago, go digital. Nowadays, jitter is practically the main noise related issue to deal with and technology is to the point these days where that can be easily rendered a non issue with most any decent digital source. With noise issues practically non existent, all you have to worry about is finding the DAC that sounds good to you. SOme can even come pretty close to sounding like vinyl depending!