According to phibbean, the author of the second update, they got an influx of followers recently (I imagine rather than shortly after that update).
They also said that they had this update in their drafts and then made it public, and that they have no idea what else could cause the updates not showing up in feeds, so maybe this was the cause.
It would be interesting to hear from other authors of updates that also behaved this way to see if there’s some similarities; please share if you notice other updates/devlogs behaving like this.