That is not what the comment says. The comment says:
but all these scams would not work in a world where authors and publishers only trust signed e-mails.
Not that people will take the time and effort to verify the signatures. Not to mention that you can still call them and say "eeeh I'm Jones, you know, I just had to renew my signature, so it won't check, but it's me. bye"
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From where would you get the private PGP key of the person who owns the email address?
That is not what the comment says. The comment says:
Not that people will take the time and effort to verify the signatures. Not to mention that you can still call them and say "eeeh I'm Jones, you know, I just had to renew my signature, so it won't check, but it's me. bye"