Nearly but not absolutely correct. While there is brewery conditioning, it is not absolute and a small amount of live yeast remains, so it is not totally 'bright'. (If there was a bright beer campaign, they would probably reject it!). Presumably this is enough to continue some secondary fermentation and prolong the life of the cask beyond that you would expect from a totally bright beer. CAMRA accepts that some filtering is acceptable - whether DB takes this too far is a whole other can of worms.
On leaving the bar, I felt a strong blow to the back of my head. Turning round, I discovered it was the pavement