Sounds like this are not unique to BBright, most bottom brackets these days are prone (BB30, PresFit30, BB86, etc.)
Sounds come from moving joints. Mostly you can't stop the movement, so grease makes it move quietly.
Have your mechanic try again - if every joint and mating surface is greased there should be no sounds. Emphasis on "every" joint - including the metal in metal of the crank's spindle in the bearings (surprising how many people forget that one).
That's assuming it's not something else, like seat post, saddle, your knees, shoe cleats, derailleur hanger, etc. etc. etc. As you can see any connection can be noisy so it pays to keep looking.