I can still access the internet via LTE while connected to CarPlay (requires both Bluetooth and WiFi). I have below settings in Mobile Devices with Internet disabled (I don't have internet subscription in the car).
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2019 X5 40i M-Sport
07/2020.54 -> 11/2020.50 -> 03/2021.50 -> 07/2021.85 [All OTAs]
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