Do iPhones sold in the US support dual physical SIMs? I saw this picture on Using Dual SIM with two nano-SIM cards, which suggests recent iPhone models may support two physical SIMs:

A friend allowed me to play with his new iPhone 12 (bought in the US), but I can't seem to be able to fit another nano SIM in the back of the tray.
Does the US iPhone have a smaller tray? Or is the form factor for iPhone 12 different depending on the market?
As it says right at the top of the support page you link to

In China mainland, Hong Kong, and Macao, iPhone 12, iPhone 12 Pro, iPhone 12 Pro Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XS Max, and iPhone XR feature Dual SIM with two nano-SIM cards

iPhone 12 models sold in the US support one hardware nano SIM and one software-based eSIM though.