That road was an accident hotspot and one of the ten roads in the borough identified as having a particular problem with speeding.
So 5 years ago, they introduced measures designed to slow speeding motorists, narrowing the road. This had the side benefit of also freeing up space for a segregated cycle lane. The cycle lane was not the point, but was an additional benefit.
If you actually read the TMO, you would realise that your objection (half a decade on) to a successful intervention to reduce speeds and collisions in an accident hotspot, is based on your not understanding the purpose of the scheme.
It worked in reducing speeds and accidents by the way. But I'm sure that's not important.