The maximum brightness on the new display option is a blazing 500 nits.

Lenovo’s ThinkPad X1 Yoga is a premium corporate laptop with 360-degree hinge, and it moves into its 5th generation with the 10th generation of Intel Core processors—the latest Comet Lake CPUs with vPro security. (The current generation already uses the first wave of 10th-gen chips without vPro.)
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https://www.pcworld.com/article/3512025/lenovos-thinkpad-x1-yoga-gets-a-bright-display-option-and-10th-gen-power.html