Seems fine to me. The author mentioned is in reference to the origin of the name, as an explanation for why it would be called that and what it is measuring. It’s not the author of the website or this tool.

There is.

Of course search engines are all shitted up with the TV show and ai slop.

Yeah that comment is wrong. I have no idea why it would say that.

Edit: perhaps it is a typo or autocorrect for “designed” meaning that it may or may not be built for bicycles.

The general access=designated may be a better description.

No, it does not. You can use it with other access tags.

Documentation is on the wiki.

bicycle=yes just means that bicycles are allowed. Most places bicycles are allowed on all the roads.

bicycle=designated means basically that it has been marked as intended for bicycles. Could be a sign or a map or whatever.

I don’t think it would cause any problems. The cycle maps generally use that information although I can’t speak to routing software specifically.

bicycle=designated

I have to say it only adds to my confusion. What the heck is a “concrete plate”??

the example looks like the worst possible surface imaginable for a road.

Being in the auto-centric US, I’ve never seen such a thing. But it seems like a sensible proposal.