Well you should ask the escrow about his paypal account.
Where is he from, does it has the paypal verified, is he able to send money etc..
If the escrow is untrusted then you are going to be scammed.
OP is the one paying for BTC with PP.
@OP this is the second thread asking for the same thing, nevertheless if the other person is surely a scammer or someone who still doesn't know that PP is highly reversible. Just withdraw it to your bank and buy BTC from either cash or Interac transfer or something like that.