Tesla’s decision on adding non-structural 2170 packs in Austin is not a positive. It’s a very effective mitigation strategy of a slower than forecast 4680 ramp, but that does not make it a positive. If you think it is a positive, that would mean if Elon tweeted they don’t need 2170’s after all in Austin, you would have to view that as a negative.
Although not clearly stated, it seems apparent that the 4680 ramp is going slower than they hoped. In calls last year, they guided 100 GWh this year, while Elon and Drew stated they were shooting for a 200 GWh / year rate by the end of this year.
If you recall, the original plan was to use 4680’s at both Berlin and Austin, with 2170’s as a fallback if necessary. It was very good news that although they didn’t hit that target for Berlin, they at least did for Austin. Now we know they need the fallback for Austin as well.
On the other hand: What was encouraging was that I thought I recalled from the call that going slower on the 4680 ramp, enabled more improvements (or some other positive benefits). So it is possible the slower 4680 ramp was intentional and beneficial in the long run and not because of issues.