A second pilot is manning passenger aircraft with 10 seats and more, primarily as medical spare. While onboard and to retain his piloting ability, he alternates as PF. While automation has reduced pilot workload and increased navigation accuracy, a second pilot is still very useful for workload sharing and a watchful eye, due to inherent human error making.
While MOL may be a superb businessman, taxi driver and tax specialist, his flight experience gives him little ability to understand the above so no such nonsense is uttered in public.