Interesting. The tire guy at local Lexus dealership made it seem like Michelin still made the M/S2. He said they don't even stock the defender because it doesn't meet Lexus' spec for the GX. The M/S2 has an "H" speed rating per the manual but the defender only has a "T" rating, so they don't carry it. I guess that makes sense, but can't see any folks exceeding 120mph in their GX lolFYI:
LTX M/S —> LTX M/S2 —> LTX Defender.
Based on your pictures in your linked thread, you had the Defender which is the latest model. If you got the M/S2 now then you bought old stock of the previous version.
Check the tire date. Tire store sold you old stock. Still M/S2 are good tires but old.
MICHELIN Defender is the latest model. M/S2 is the older/previous model.