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Apple to Limit iPhone 15 USB-C Cables to USB 2.0 Speeds: Report
(www.extremetech.com)
This is a most excellent place for technology news and articles.
Yes they don't support. It's different from supporting and limiting. I'll bet there will be a super-duper-special USB cable or dongle you'll be able to buy in order to get full speed.
We don't have the information needed to speculate that this is the case.
The Pro model has the faster speeds while the regular model doesn’t.
That just means there’s different hardware in each device.