In the third paragraph: > The new cap appears as a uniform color in Voyager’s range map... compare it to the old cap, whose silicone valve is denser than the surrounding plastic. Author: you must be completely blind. Both photos show a wide gradient of colors including blue, green, yellow, and deep orange! Why does orange in the left photo mean "it is silicone" but orange on the right means "it is PP"?
The picture shows the screw threads of the bottle opening meeting the threads of the cap. And you can see some asymmetry where the part on the left side of the bottle opening is vertically lower than the part on the right side, which is consistent with the thread being a spiral shape.