It really doesn't. Elon and Tesla have BOTH been clear (since Battery Day) that 2/3rd's of Tesla auto production will use LFP (ie: Iron-cathode) chemistry. Further, ALL of Tesla's grid-scale storage products (ie: Megapack) will use LFP.
4680s will be nickel based, so important for high range/high performance products like Cybertruck, Semi, and Roadster. These 3 applications (probably less than 10% of production by volume, or <2M/yr) will require 4680s, but TESLA will be MASSIVE without any contribution from 4680s whatsoever. Two partners are also ramping 4680 cell production (Panasonic, LG). It WON'T be an issue.
Sasha Yanchin made this mistake in his recent video on Tesla. He (wrongly) claimed that Tesla Energy would be constrained by 4680 cell supply going forward, so he reduced his estimates. Apparently he also missed the multiple times Tesla as told us that grid-level storage will be all LFP. Understandable he'd miss that since he follows the whole market rather than focusing on TSLA, but a major mistake nonetheless.