pretty sure this tsb is regarding vehicles that didn't receive front heat/ventilated seats and rear heated seats due to the chip shortage. I picked up a 2022 envision avenir and the heated and ventilated seats are to be retrofitted at a later date when the chips are available. You can see it mentioned on the TSB on the important section:
Important: Vehicles designated with RPO: 00V and/
or RPO: 00R are planned to have a future update to
enable the Front Heated/Ventilated Seat and/or Rear
Outboard Heated Seat feature. Vehicles designated
with RPO: RGJ will NOT be eligible for retrofit in
relation to rear heated seats (but will be eligible in
relation to front heated or ventilated seats). Do Not
attempt to enable this content apart from official
direction for retrofit.
Important: Vehicles designated with RPO: 00V and/
or RPO: 00R are planned to have a future update to
enable the Front Heated/Ventilated Seat and/or Rear
Outboard Heated Seat feature. Vehicles designated
with RPO: RGJ will NOT be eligible for retrofit in
relation to rear heated seats (but will be eligible in
relation to front heated or ventilated seats). Do Not
attempt to enable this content apart from official
direction for retrofit.