The holodomor as it is reported in the West appears to be a myth. There was a widespread famine where more Kazakhs and Russians died than Ukrainians, and the USSR did try to send Ukraine provisions but not enough. Also there is under reporting in the West of kulaks burning their fields instead of giving them up to the govt. Stalin even thought the West might have been responsible but that seems to just be Stalin being Stalin.
That’s not exactly a genocide, just more incompetence as usual.
The man whose work is most often cited has been refuted by his own wife and the initial publishing came with doctored photos that he removed when they were called out.