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What’s going on with the ‘update from Apple’ that Audio Damage apps are receiving?
New updates are becoming available for Audio Damage apps (Quanta2, Continua and Eos2 so far) which say

These updates seem to be added to the last updates which were released rather than having their own entry in the AppStore version history as well.
Anyone know what this ‘update from Apple’ means?
Comments
And phosphor
Ah, yeah, I didn’t check the ones I don’t have installed. Thanks @BiancaNeve.
I wonder what Apple have done to ‘improve the functionality’ and why it’s being pushed out on a per app basis like this? Strange.
Looks like it’s rolling out to other apps too. I’ve got 5 updates ready and they all say the above and are all unrelated.
It seems that these apps were already updated by their devs within the last week or so. The update dates shown are those of the dev's update, not the added Apple update. I see it for DrumLab, as well as the Audio Damage apps already mentioned. I wonder if Apple released those updates without an updated Apple component (library?), and they're trying to catch up.
Edit: It has also affected VLC, and possibly Tera Pro (there was a second release of Tera Pro 3.0.2 with no explanation, unlike the others).
Interesting, must be something like @uncledave suggests?