I think they really did just make the one (or more realistically maybe a handful, and only the 1 is known). We probably found out about the new pack in its first days of public beta testing. If this is supposed to be a mass produced fix for whatever critical recall they are still band-aiding, they probably want some real world data showing that the fix is a real fix and not just a more expensive band aid. This would explain the extensive delay tactics we are seeing - they had to design, engineer, and build a new 85 replacement pack that didn't have the presumably hardware-intrinsic defect of the previous packs. I think the general consensus now is the defect is thermal related since EVERYTHING negative Tesla has done from 2019.16 and newer seems to be aimed at lowering pack temps and their initial press release in response to the fires called out both charge and thermal settings. I know if I was planning to replace thousands of batteries I'd want to be 100% certain I only need to do it once (terminally ill replacements excepted - as was the case with Takata recalls in some instances wher ethe same airbag was recalled several times while a permanent fix was still not available but the original was too unsafe to remain in use)