So, to be clear: BBR only applies to the edge nodes (the client and the server) whereas CoDel and other AQM are (mostly) for the routers in between, especially bottle-neck points, right?
Yes. CoDel/AQM can only help bufferbloat if you control the bottleneck. However it's possible to artificially make your router the bottleneck if you get really steady bandwidth.
BBR only helps TCP but will help prevent bufferbloat along the whole path
