To me, the first-level factors are technique, setup, and strings. Free or inexpensive to change, but if you dial them in and match the bass, these make the bass shine. Next, more expensive but important are pickups and electronics changes, tho these can be cheap (eg series/parallel wiring, loading capacitors). Even more expensive but critical are pickup positions - but if you know what you’re doing, you get the (approximately) right bass to begin with. Obviously what comes after the cable matters, but I always just strive for the cleanest and clearest amplification/settings to let the hands and capacitors do the work. Of course room matters, but also where you put your gear, and where you stand in relation to gear… sometimes I wish my ankles had ears
The video is ok, but they make some critical mistakes. Essentially, it seems like they had their conclusions and made the video to “prove” them. Foremost, some factors matter most in certain circumstances - like string type matters more when paired with certain techniques (slap is a good example). In general, they ignored interactions between the components/factors…
Also, electronics and cables can matter if you know what you’re doing. They did not mention resistive and particularly capacitive loading, which both can matter for filtering (or matter a lot - at the extreme, that’s how a tone knob works). Also, pickups of the same type (housing) can sound very different depending on what’s inside (even P vs. P, but think about soapbars that can house singles, splits, stacks, sidewinders, and dual/quad/multi-coil humbuckers)…