And if I go through Paypal, then I should be protected if anything goes wrong, right?
Assuming you use a credit card (CC), yes, the CC bank will protect you. PayPal themselves offer little to no help other than the ability to use a CC.
Yes, the ad shows 15 Amp IEC US AC Plug. Is that what's being used in
France? I believe France uses 220-240 volt, so does that mean they use a
different plug?
France uses Schuko male plugs for their 230 V requirements. Google it to see what it looks like.
It is important to make sure that the cord not only has a 15/20 A IEC female connector, but that it has US male plugs, and not the Schuko male plug.