The new part superseded the 195F thermostat in mid 2021. All that are out there now should be the new ones. They have a code stamped on them. I think it is “70” but I’d have to look again. The new part should be readily available. There was a long thread on this.
I suspect the original reason the engineers designed it for 195F was for slightly better fuel efficiency. I’m guessing when they saw the degree to which the system temperature climbs above the set point in a long pulling climb in warm conditions, they decided they should open the cooler flow up at a lower temperature so you start hot climbs 40F cooler. Since most customers want longevity over 0.01 more mpg, and lower transmission fluid temperatures probably improve longevity, many have changed the thermostat, some with the dealer being willing to interpret the TSB to cover it even with no transmission “malfunction.” My dealer refused. It’s easy to do yourself. One person in the prior thread said almost no fluid is lost when changing the thermostat. I’m going to change mine right before my first fluid change so the fluid level will correct.