The blog you link to is misquoting the signs.

Signs warning cyclists not to pass large vehicles on the inside are becoming quite common in the UK.

And a good thing too.

Many of the cycle fatalities that have happened in London over recent years have been caused by cyclists riding up the inside of a large vehicle that is about to turn.

With the best will in the world, the driver of a large vehicle can't be constantly checking their inside mirror for cyclists putting themselves in a dangerous position while also looking ahead and steering. And there are big blind spots on these vehicles.

These signs are good. They are not a sign of a badly driven vehicle. Rather, they are an important reminder to cyclists of the dangers and to take responsibility for their own safety.