Unlikely, since even the "blocked" results don't show a complete block. It's more likely to be either location-dependent (less censorship in metropolises, more in Tibet and Xinjiang) or it's simply being flaky.
To accommodate the demands of CPC on this site would do this site more harm than good. It's obvious they don't respect the need for free and open speech. You can't really dialog with people like that without losing as over time they will strong arm you into only saying what is acceptable to them.
Nothing like that has come close to happening, not just about China but about anything, for as long as I've been admin. Our world would have to go through a series of state changes for anything of that nature to become possible. That would be dismaying, so it's good that there aren't any signs of it.
Yes, they hired Qi Lu, former COO of Baidu and last I checked thye had a start-up program based in China. I'm sure they have the technical abilites to censor if they choose to.
I haven't seen any anti-China articles on HN. There have been news articles that threw light on how people from Hong Kong and mainland China suffer under the communist government of mainland China.
I redid the check and the result is now "contradictory" and not "blocked". Previously, GreatFire's reported China-1 being able to access HN while the others were blocked, the second test shows China-3 getting through while the others don't. Maybe GreatFire randomizes the numbering of their servers between tests to avoid leaking their location? In any case, the site doesn't appear to be completely blocked yet.
Edit: And now the test results have changed again, showing 5 servers, of which 2 receive a response. The assignment of server numbers is also definitely different from before.
Contradictory 11:55:49 AM
Blocked 11:37:07 AM
Contradictory 11:20:47 AM
Contradictory 10:15:02 AM
This sounds like some sort of automatic system, and might be related to Hong Kong protest posts appearing and dropping off the frontpage.