Hi David,
That is correct. If you are interested in an ARM based Windows 11 device, the Surface Pro 9 with 5G offers this. More information here:
Surface Pro 9 (Specs, Price, i5/i7, Battery Life) - Microsoft Surface
Regarding the Surface RT device that was released 12 years ago, while it uses a very early ARM based processor, it is nowhere near meeting the requirements required from a modern OS.
Hope this helps,
Greg