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Yes, you can't repeat sections, other than small linking bits
I think the phrase is "can't unnecessarily repeat sections". So you can use the same section in/out of a control multiple times if you don't have any other choice but the route should diverge as soon as reasonably possible.
It's to allow rides like the many loop "cloverleaf" rides from the 'Uts in Henham/Ugley. There are only really 3 directions you can go from the huts and so a ride made up of multiple loops has to use some of the same roads for a bit, but then each loop then goes off in its own direction as soon as it can.
(In all the times I've done an 'Uts ride I've never been to Little Henham (since it just loops back onto the other road. Might have to do that next time I'm ever up that way.)
Is it possible to run a route that is a 10km loop 20 times for a DIY 200 ride? Not that I want to do this but is there any route rules that mean you can't repeat sections several times, or repeat control points through the ride? Alternatively a route that goes 25km North from a point then back on the reverse of the route, then the same out East, South and West up to 200? It might be written somewhere obvious as I've never looked into it with any depth. Just something I've wondered about.