About this case in particular, one problem I have is that they seem to censor the entire domain. Most of the content on that site is bad and definitely violates Facebook's rules. A lot of it is straight up lies made up by the site owner for political purposes.
However, some articles on the site are just political opinions about the CCP. Because Facebook blocks those, I think the merits of this censorship at a coarse grain are worth discussing.
When 99% of your content makes the rest of it look good, you willingly assume that risk. Nobody should be shedding tears about this.
Also, censorship is forbidden only to the government and to common carriers (which Facebook is not). Private parties (with very rare and reasonable exceptions) have the right to control what others do with their chattels.
However, some articles on the site are just political opinions about the CCP. Because Facebook blocks those, I think the merits of this censorship at a coarse grain are worth discussing.