IMO this is one of those information advantages that we have over the market. WallStreet doesn't have a clue that in "12 months maybe, 18 months definitely" the 4680 production is at volume production. This translates to May 2022 to November 2022.
I wouldn't say "definitely". I certainly think that will likely be the case but, from where I sit, this is one of the biggest risks to our investment, that it takes longer than expected to develop the manufacturing of 4680 to the point yields are such that we can reach the targeted margins. I suppose it's possible Elon was sandbagging but look at his direct words (from the call you quoted):
And basically, this is just a guess because we don't know for sure, but it appears as though we're about 12 -- probably not more than 18 months away from volume production of the 4680.
The key word is "probably". There are two reasons I'm not particularly worried about this:
1) It looks to me that Tesla will probably be OK, not great, but OK, if it takes longer than expected to ramp 4680 to volume production. Because they have not instructed their other battery suppliers to slow down.
2) There is not a single thing an investor can do about this other than buy, sell, hold and/or hedge (yes, oversimplified, but you get my point).
I'm holding unless I see a problem that the share price has not recognized. The problem is that these things tend to get discounted in the share price gradually as the odds of delay rise. The fact that 4680 production might not be as soon as projected is probably already discounted into the share price to a higher degree than the actual risk of a delay. That's my judgement call based upon my perception that Elon has a reputation for being late that probably exceeds his actual tendency to be late. But this isn't about Elon so much as it is about manufacturing processes (which we know are difficult). But Elon knows it's difficult and he's the one that projected 12-18 months, probably. So, without inside information it's pretty unrealistic to expect to be able to trade profitably based on the speed of 4680 ramp. And trading based on inside information (assuming one had any) puts a person at risk of jail time which would just be too stupid to risk.
If things go as projected, we all make out like bandits, if not, well, we might have to wait longer. Nothing is a given in this game. Yes, I'm stating what should be the obvious but I'm saying it because I've seen a lot of the "sure thing" mindset recently. I see this as a situation where the reward is much better than the risk. And the longer your time horizon, the more true I think this is.