In this case far-left mean groups that are opposed to objectivity and support adding bias to science. This is the 2+2=5 crowd. They can believe whatever they want, but this is not science and is born out of neo-Marxist ideology.
Wait you think Marx was pro science? He denied the supernatural, but like all ideologies reality is secondary to dogmatism. Don't forget he was routed in Hegel.
Marx's ideas were refined by Antonio Gramsci who offered social Hegemony as a means to achieve the utopia. To the extent that science is a sense-making part of society it must be taken over by pro-marxist/communist forces. It's the only way to assure the success of marxism.
Using Lysenko as evidence that Marx was anti-science is kinda weird.
Stalin had thousands of Lysenko's critics imprisoned, I dunno how Marx would feel about that, but I have a feeling it wouldn't be particularly positive.
What does Hegel have to do with anything here? Adam Smith was also "routed in Hegel"...