w3c на гитхабе? ^_^Я сомневаюсь, что selenium вам "врет"
Как сказано на w3c https://w3c.github.i...-displayedness
https://www.w3.org/T...t-displayedness
The visibility of an element is guided by what is perceptually visible to the human eye. In this context, an element's displayedness does not relate to the visibility or display style properties.