Yes, obviously. If you didn't want that, you should have bought another charger, maybe Bluetooth only, and add your home-grown layer on top of it.
Can I ask why don't you want a Tesla charger talking to Tesla? Seems a bit odd if you already own a Tesla vehicle that is just piping the data to Tesla all the time.
Is it possible to connect it to your wifi but block it talking to the internet? I'd be curious to know if that stops the built in SSID.
Mine did
And make sure the firmware is up to date. Mine is at 26.2.2.