Once a key pair has been revoked, is it still possible to decrypt messages that were previously encrypted?
What if the key is / isn't protected with a strong passphrase?
From what I understand, it is possible since the private key is not modified (or is it?) when revoked. Even if the private key is modified, the numbers making up the private key can be extracted and thus possible to create a new, non-revoked key that can be used to decrypt the messages.
Quoted from https://emailselfdefense.fsf.org/en/
If you lose your private key or someone else gets ahold of it (say, by stealing or cracking your computer), it's important to revoke it immediately before someone else uses it to read your encrypted email or forge your signature.