Sorry for being late. Waiting to take orders from now on.
It doesn't matter who vouches for you.
If someone initiates an UNAUTHORIZED credit card chargeback or bank ACH dispute you cannot win UNLESS it is for a physical item shipped to a confirmed address with tracking. PayPal sometimes requires a signature as well, however, if the amount is over $750 USD a signature is always required. In this case, even if PayPal does not win the claim against the bank/credit card, PayPal takes the hit and funds the amount because it is covered by their terms.
The above statement is about UNAUTHORIZED chargebacks. Chargebacks for items not received/significantly not as described are basically the same. ALL "chargebacks" are initiated by a 3rd party, NOT PayPal.
There are also all the standard PayPal initiated disputes. Which are not chargebacks initiated by a 3rd party. Is your guide for the standard PayPal disputes, which are NOT called chargebacks?
It is not possible to win "any" case.