The Holodomor is only related to Lenin insofar as the system Lenin established with 'war communism' was not agriculturally robust, and the backpedaling of the NEP didn't outlast him.

All the major factors of it - the mass collectivization, the export of food from starving regions, the export of food from the Soviet Union itself, the deportation of 'kulaks' to Siberia, etc etc etc, were all Stalinist initiatives. Maybe you could argue that if Lenin had legitimately improved Soviet agriculture it wouldn't have happened, but other than that, I don't know that there's a strong argument for putting Lenin - shithead though he was - in with the causes of the Holodomor.