No help on those two therapies, but I can share my experience. I was recently diagnosed with the same ‘advanced tendinitis distal quadriceps tendon’. The Dr has put a big emphasis on eccentric exercises to strengthen and stretch the various leg muscles-(nordic hamstring curl, side steps, eccentric calf raises (up on two feet, down slowly on one), etc. I feel like the PT was not as on board with emphasis on eccentric movements, but I’ve found them to be very helpful. While I am not sure of their benefit, I do not mind the massage , scraping, ice & stim!
I was never restricted on riding and given the green light to road cycle as much as I wanted, they just did not want me to any type of mountain biking where there could be any type of impact to extended leg. I felt like it was a huge help to have a Dr who not only specializes in sports medicine, but is a cyclist as well.
At this point, the only things that give me pain are ladders & scaffold.
Best of luck to you!