It could still be possible, albeit unlikely, that the Switch is using the X2. The Denver 2 cores are designed by Nvidia while the A57 cores are designed by ARM. Maybe ARM just wanted to focus on their specs rather than Nvidia's so that it seemed more like their work.
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Re: ARM Confirms That The Nintendo Switch's Chipset Is Very Close To Tegra X1 Spec
It could still be possible, albeit unlikely, that the Switch is using the X2.
The Denver 2 cores are designed by Nvidia while the A57 cores are designed by ARM.
Maybe ARM just wanted to focus on their specs rather than Nvidia's so that it seemed more like their work.