the jury is still out there on platelet rich graft in that we don't have many studies to support it but it is promising and here is a conclusion from an article published 2012
CONCLUSIONS
Within the limits of this animal study, it was concluded that PRP in association with GTR and BG may enhance the amount of new cementum and provide a more mineralized bone (mature) in a shorter period of time when applied to the treatment of class II furcation lesions in dogs. Future studies are required to clarify the mechanism of action of PRP in the periodontal regeneration process and the ideal platelet and growth factor concentrations to adequately promote periodontal regeneration.
J Appl Oral Sci. 2012 Mar-Apr; 20(2): 162–169.
Journal of Applied Oral Science
Bauru School of Dentistry
Platelet-rich plasma in the treatment of Class II furcation defects: a histometrical study in dogs
My answer would be NO. This because bone needs months to repair or grow, but soft tissue does it a lot faster, just weeks. PRF has another benefits but I don't see it being a cellular occlusive material since it resorbes no more than 2 weeks after, just like any other soft tissue would heal.