No. This diagram is depicting the creation of a shared secret for symmetric communication. PGP is asymmetric. I tell you what. Do you have a PGP keypair? P

No. This diagram is depicting the creation of a shared secret for symmetric communication. PGP is asymmetric. I tell you what. Do you have a PGP keypair? Post your public key here (the one you would host on a public keyserver) and I'll show you a short script that can encrypt information that only you can read using your private key. It will use no other keypair besides your own public key.