When I2C_POWER_INVERTED is driven HIGH, the Q1 MOSFET turns off. This is supposed to turn off external I2C power.Low Power friendly! In deep sleep mode we can get down to 30uA of current draw from the Lipoly connection. Quiescent current is from the power regulator, ESP32-S2 chip, and Lipoly monitor. Turn off the NeoPixel and external I2C power for the lowest quiescent current draw.
However, the i2c pull-ups (R3 and R6) are connected to 3.3v not VSENSOR. Since Adafruit STEMMA QT sensors also contain resistors between SDA/SCL and 3v3, the i2c sensors are still powered through the pull-ups.