This was quite alarming! I thought it meant that Authy is discontinuing their iOS app entirely. Would have been great to mention even more explicitly that this does not impact iOS devices.
As of now, I can still see Authy on my iPhone App Store (last update 3 days ago). Indeed, I am not able to install it from Mac App Store on my desktop/laptop.
In any case, this resulted in my offboarding all my 2FA to a different app. Sorry, Authy and Twillio...