Accepted answer
The flag fires when SparkLine can't find enough recent long-form upload data to compute reliable per-video performance stats — it doesn't necessarily mean the creator is gone dark. It can also trigger if the creator posts primarily Shorts (which aren't counted as long-form) or if they've had a recent upload gap.
Best thing to do: click into the creator profile and check the posting cadence manually. If they're actively uploading but just shifted format (e.g., to Shorts-heavy content), weight the score accordingly and don't penalize them for the flag.
Ryan O.