Yes. Can you clarify it for me? Sounds like snake stuff
Unlike most cables that can be considered snake oil the capacitance of the cable between the cart and pre-amp can have a large and measurable and audible effect on the FR of the system with an MM cart. The cable mentioned had 160 pF of capacitance inside the tone arm which is high ( about 200 pF for the total of the tone arm cable and TT to pre-amp cable of 200 pF or so is considered "standard"). The problem is it is difficult to change the cable inside the tone arm. Since capacitance only affect MM carts (not MC carts) it was mentioned that a MC cart was used to get around the high tone arm capacitance issue. While maybe a little off topic there is no snake oil involved. You can search MM cart loading for more information.
Another way of phrasing this is that part of the downside of vinyl is that it's surprisingly easy to pick parts of the signal chain that interact poorly with each other and screw up the sound in detectable ways. Even the manufacturers do it at times, and if someone who doesn't know what they're doing (which is 99% of the people who aren't the manufacturer) decide to start swapping cartridges or especially tonearms / cables etc, regardless of the subjective perception, the objective result is quite likely to be worse.
The phono preamp also gets included in this equation. Most preamps have minimum to no adjustability for their input parameters, and are hopefully tuned for a reasonable medium (assuming a mass market table and MM cart) but may produce weird sound if you deviate from that. Fancier preamps (or DIY jobs) may have more adjustability but that's also more things for the end user to screw up. Adjustability also assumes the manufacturers correctly measure and publish specs of their product, and their manufacturing lines are consistent.
Throw in things like background rumble, various surface crud and needle wear and it takes real work to get a consistent, maximal quality signal from a record. Selecting and matching components properly
will get better sound out, but this is partly the birth of audiophilia where people assume they can skip the math and physics of the problems and just throw money at it, because surely that will make it better. And thus at some point even the manufacturers don't bother with the math, because when you're charging that much you've long since focused on the customers that don't care.
Meanwhile you could record the same signal to digital disc or FLAC file and utterly trounce the measurable quality of the playback chain, and do it with approximately no maintenance with a setup a layperson could run all day even on the weekends.