I agree, but I think "Help us China" without more context is just "China will save us". IMO "we can't save you, you have to take these steps yourselves" is a reasonable response. If "Help us China" was instead a detailed comment pointing out things that communists in other countries are asking China for that they could easily give and that would really advance their revolutions, I might feel differently.

What's relevant about the commenter being in the global north is that the global north has no real ongoing revolutionary movement that is even at a stage where it could seriously benefit from Chinese assistance. One day the PSL might need Chinese small arms and ammunition, but not today. Today, that would just lead to the PSL getting instantly shut down.