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I believe both photos must show the cap while screwed onto the bottle. In the photo of the new cap, the orange stuff is the bottle.

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.

I agree with what you're saying, but the general statement by the author seems to hold up. They don't appear to be the exact same shade of orange, as the silicone tip is a bright, deep orange, and the cap on the right only has little mixtures of orange in the overall shape.

In the right image the dark orange is the bottle which is a separate (uniform) piece.