That is not exactly true. Paypal will side with the buyer about 90% of the time regardless of precautions. Most buyers are not scammers, but those who are know that they can pull all sorts of stunts and there is nothing a seller can do.
I’ve heard of scams where the “buyer” sends a check for well over the amount of the item, and tells the seller to not cash the check for some period of time and to “keep the rest for your troubles”. Of course the check is no good. Not sure how this applies to Paypal, since they went to all debit/credit card only.
I’ve been a powerseller on ebay for 10 years and I have lost exactly ONE dispute so PayPal has been siding with me as the seller about 99% of the time.
Sellers only lose these disputes because they fail to follow the seller protection policy rules (or don’t even know they exist).