They seem to have gained access through getting secrets from developers as far as I understood it. So with 2FA they would have had a much harder time to gain a

They seem to have gained access through getting secrets from developers as far as I understood it. So with 2FA they would have had a much harder time to gain access to the database. The part of changing the seed only matters for customers of the hacked company but is (as far as I can tell) unrelated to them gaining access.