The Sage Advice Compendium states:
Official rulings on how to interpret rules are made here in the Sage Advice Compendium. A Dungeon Master adjudicates the game and determines whether to use an official ruling in play. The DM always has the final say on rules questions.
The public statements of the D&D team, or anyone else at Wizards of the Coast, are not official rulings; they are advice. The tweets of Jeremy Crawford (@JeremyECrawford), the game’s principal rules designer, are sometimes a preview of rulings that appear here.
Sage Advice answers that are relevant to the current state of the rules are compiled here
I always thought that only the answers published in the SAC are official. However, the SAC also states that it compiles "Sage Advice" answers. It is not clear to me entirely if "public statements" intended to include other official Sage Advice columns or not.
The Sage Advice column is also providing Sage Advice answers, even if they are not yet included in the SAC. Technically, this is also a "public statement" of "the D&D team", but they clearly read a lot more official when it comes to the company's take on the rules, than a tweet JC might make, and I am not sure if what they mean are just individual statements made by members of the D&D design team in some other public context, like when it points out that rulings given by Jeremy Crawford on twitter (now X) are not official.
In addition, the SAC itself has not been updated in a long time, I think not since version 2.7 came out. The latest version, announced also in Sage Advice, seems to be dated from November, 2020, and there are two later entries in Sage Advice that contain rules content that has not made it into the compendium, the this one and this one. (Even those columns stopped with the one of December 13, 2021). However, the SAC lists a copyright of 2021, not 2020. So I am not sure what came last.
This highly upvoted answer related to the SAC maintains that anything published on Sage Advice counts as official rules clarifications. Do these additional columns contain official rules (or rulings) content?