From your replies, it seems like you are talking about maoists and other ultra-left deviations and not Marxism-Leninism.
"Orthodox marxism" doesn't exist except for said ultras and maoists in my experience. Marx gave us tools, not a blueprint or dogma. Orthodox tools are not a thing.
Other than that, there does not seem to be much difference between the Yang Heping stance and us. Where we seem to overlap with YH is Iran and Russia are to be supported for utility reasons only (critical support), but where we differ, and where YH reveals himself as an ultra, is that YH categorises these two countries wrongly as "imperialist".
I highly doubt that YH stance is the only stance available from a person that calls themselves Marxist-Leninist in China. China has 1.4 billion people, how big is this guy in the Marxist-Leninist space of China?
I do hope that he does not represent the standard of Marxist-Leninist analysis by Chinese leftists.