This is a global problem, walled gardens may have made it a bit harder, but it isn't unique to China.
Internet traffic overwhelmingly goes to fresh content everywhere. The link may still be available, sure, but just how many people eventually visit old articles? They are, by and large ignored because people want new content that might be relevant for few days.
Not that it seems to matter - article by themselves mostly expresses fleeting opinions. It's hard to come across a truly philosophical work with long term implications - and even then it gets buried anyhow, regardless of where it is.