The first page of the referenced UNESCO document refers to the 'red thread', with the link you provided linking that to Communism. Now, whoever at UNESCO actual

The first page of the referenced UNESCO document refers to the 'red thread', with the link you provided linking that to Communism. Now, whoever at UNESCO actually wrote that may well have been a communist and may well be pushing communist ideology, but googling the phrase brings up a traditional Chinese myth which would give a different sense to the phrase - that of an inevitable and inherently compatible match. I'm a bit unclear on whether or not this is the right interpretation, but it seems a bit more likely than obliquely referencing Communism when it comes to sustainability, and the link you provided seems to simply be implying the link to Communism rather than stating why this phrase is unambiguously linked to it (other than the colour red). To me this might be like seeing the phrase 'red letter day' and implying a link to Communism. Any clarity possible?