You left out the parts about (a) Lanier had to borrow some of the guns from Philadelphia because the Washington PD didn't have all the types Feinstein requested [in your quote from the article, but worth pointing out specifically], and (b) Lanier had asked that it NOT be made public that the DC police assisted in any way with the dog and pony show. She and her spokesperson tried to stonewall the issue. When it finally came out, both Lanier and Philadelphia were less than overjoyed at being outed. She then decided that her department "probably" won't participate in such shenanigans in the future.
So, just another case of some people being more equal than others. Nothing to see here, move along, move along ...