He probably didn't tell you that Tesla LFP EVs would degrade and lose the first 10% of range twice as fast as non-LFPs because LFP EVs must be charged to full 100% frequently.
All lithium ion batteries, including LFP, degrade much faster under high SOC or high C (or even high DOD, extreme temp). In stationary energy storage systems under low SOC/low C-rates (eg, home powerwalls), LFP could last quite longer than other LIBs and this has been studied for years and widely accepted.
But, contrary to Jeff's Dahn's claim on Tesla's LFP battery pack, we don't really know much about LFP's true lifespan/performance in moving vehicles since they were deemed unsuitable for EV's with high SOC/high C-rates until China spiked them up a few years ago and they weren't studied as rigorously in that particular application/environment. Even as they are mostly limited to entry-level, low-range EVs, there are some early data indicating that LFP degradation in EVs is significant:
Tesla LFP Battery 10% RANGE LOSS PROBLEM? | Model 3 RWD https://www.youtube.com/watch?v=suw20wPrbL0
The brand new LFP batteries will degrade substantially quicker. There's not long-term retention data for LFP batteries on the market yet, but the trend tends to be substantially faster degradation. Trends show them stabilizing around that 10% degradation mark in about half the time as non-LFP batteries - around 50,000 miles instead of 100,000 miles."