As the name implies it's for local trading, i.e. meet up. PayPal and Bitcoin have never mixed. Multisig will not fix the PayPal problem.
Agreed.
Paypal is BAD for bitcoin. A scammer or even a disgruntled buyer can claim it was fake even many months later.
Note: Paypal requires that you provide an online tracking number. Since you didn't ship the coins, it is not trackable. Don't be dumb enough to think the blockchain is considered online tracking as no transaction proves YOU sent the bitcoin or that the other party is the receiver.