That was largely due to poor key management, human errors and some flawed implementation choices such as using weaker algorithms or shorter keys. When implemented properly and with modern cryptographic primitives, PGP itself has never been fundamentally compromised. That said, go ahead, you are free "to invent the wheel" to use it for SEED phrase masking.
You've just discovered the essence of the post, which is that even if this data (the seeds) is leaked, security is not lost because the leak due to hacking was partial.
I don't understand what sense it makes for you to go to a purely experimental thread and publish what we all already know or should know.
Your comment is the equivalent of going to a philosophical debate thread about the existence of God and saying "God doesn't exist" without going into the purely philosophical aspect.