Bullshit. A cat's primary weapon is it's rear claws. The fronts are merely a warning of things to come.
Again, bullshit. Our cats barely knew they were declawed. It was dune at the same time as neutering. By the time the anesthetic fully wore off they were running all over the house. No harm no foul. If the cat is in serious pain after declawing you took them to a butcher.