I wasn't sure what your point was Nayan. If you are interested in the plan then I recommend reading up. The 4:30 debutant and the 2:45 aspirant will equally carry a lot of fatigue and would most likely be as likely to get a cold as a P&D plan. These plans all fall off the Lydiard branch. Same principles, different execution.
It is a common misconceptions that there is no place for a 20 mile run in a Hanson Plan - go look at the 60-80 mpw off the shelf plan. Don't rely on a couple of internet articles written several years ago by Running Times and RW.com.
A different tendon involved, but my Foot/ankle consultant is not doing PRP injections anymore - too many poor / bad outcomes. He takes things as far as ESWT and then surgery only if something odd comes out on the mri.
If you insist, go to a Dr and ask for private referral. Don't be surprised though if the treatment you seek is not offered. You may be left with a dent in the wallet and a cd full of mri images .