I don't exactly love it myself, but it appears to definitely be a thing, going by Oda's SBS answer on Garp's punch hurting Luffy indeed being love and not Haki, and Sanji defying the laws of physics in destroying Kizaru's laser.
I have no doubt Kuma saving Bonney was powered by PoL.
I also believe Rouge was able to carry Ace for 20 months because of PoL.
imo PoL is related to Haki, but it's not necessarily its own branch.

I have no doubt Kuma saving Bonney was powered by PoL.
I also believe Rouge was able to carry Ace for 20 months because of PoL.
imo PoL is related to Haki, but it's not necessarily its own branch.