I got my Model Y Friday 10/10/20. My left rear tire was completely flat 10/11/20 after driving 60 miles. Fortunately, most of the air leaked while the car was in my driveway and I had a tire plug kit and compressor at home. I was going to make a post with the same exact points and opinions of the OP until I found this thread.
Also, I don't know about the specific type of TPMS in the Model Y, but this stuff might be OK to use (I always have it in my motorcycle tires):
Ride-On is safe to use in combination with most TPMS or Tire Pressure Monitoring System sensors, provided that they are hermetically sealed. Ride-On is a liquid and if it gets inside the sensor, this may affect its efficacy negatively. Always check with your dealer if your sensor is hermetically sealed.