The
Plane Talk materials are all about understanding the fretboard and the underlying principals of music. It really isn't about any particular style of playing. Will it help you specifically to play finger style better? Probably about the same as it helps other areas of playing. It would help you to understand why Kirk plays the notes he does in his finger style tunes and it would help you understand what you need to do to to write your own tunes. Save up for it over time. It will be here when you have the cash. Figure it will save you having to buy chord and theory books over the long run. Don't spend your rent money to get it. You could always spend your time on really getting your pre P.T. skills honed so that when you do buy the material's you can really absorb the new information.
Har. Kirk beat me to it again. Gotta type faster.