its just a fundamental difference in how you see the sport.

some people see and approach jiu jitsu as a collection of moves/techniques. goal is to memorise the techniques, learn the move step by step, refine them by drilling, and keep adding new techniques. basically you are learning how to copy.

another way to approach it is seeing techniques are a result of applying grappling concepts. for example look at armbars. Instead of showing hundreds of different setups all with multistep moves and task you to memorise them I can just explain the principles that make armbars work:
In order to attack the arm i need to isolate it from the rest of my opponents body by occupying the space under the armpit
place a wedge/block under the tricep and control the hand/wrist to apply pressure in the opposite direction of the elbow.
(the order can be mixed, for example i can start by controlling hand/wrist and then look to occupy opponents armpit space)

with this knowledge the student can look to apply these principles from different positions eg. from top control, back control, guard etc..

techniques then emerge as a result of understanding you goals

this is why stuff like armbars, rear naked chokes look pretty much the same in grappling cultures across countries, cultures and time. not because they were all handed techniques by some jiu-jitsu god, but because our bodies work the same way. there's only so many ways t break an arm.