How to do I2C on Arduino with SDA and SCL pin already used
No, you can't just use it. While I2C itself may work, the screen will keep resetting itself all the time and will be useless.

You may be able to get some luck with a software bit-banged I2C  on other pins. However I would personally choose to modify the TFT screen's PCB and cut the LCD_RST signal from the A4 pin and connect a 10kΩ resistor to +5V, or re-route it to another pin. That way you can then use I2C.