DNSSEC is not going to do anything if you have the username/password account for your domain registrar account hijacked, and somebody logs in and changes the authoritative nameservers for your domain.
This whole notice really boils down to "seriously, people, if you lose control of your domain registrar account, all bets are off"
This whole notice really boils down to "seriously, people, if you lose control of your domain registrar account, all bets are off"