No, but it's known for being commonly used in PGP. I could be wrong, but that's what I understand when someone says, "PGP-style encryption."

"PGP-style encryption" probably implies public-key cryptography.

Like the other poster said, using various computer inputs to feed the entropy source during key generation is not specific to PGP or public-key cryptography at all.

That seems like a misleadingly-broad term, but sure. IMO, public-key cryptography (or just asymmetric crypto) is already an improvement over "the Diffie-Hellman key exchange," which is what's generally implied when talking about public-key crypto.