Is the current climbing wiki correct?

No, of course. For this, one still needs the route/route_bottom to exist, so that it can be linked to the line (stored in a separate field). The line is then drawn on a photo, which is Wikimedia Commons (link).
This is good enough to identify a route with a target grade range from the ground.

But there is not much need to add routes that are (almost) vertical. route_bottom is enough. This view covers the actual route from the right perspective. Only longer routes (over a ridge, multi-pitch) deserve the effort of being drawn as a route, I find.

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