We know that “conservative” Catholics think doctrinal development aims to reverse teaching, but I don’t know why you would think “progressive” Ccatholics agree with them.

You already know the contortions that have surrounded “false witness.” White lies. A little fib. Etc. 
You know, and I think endorse, much of the development of “You shall not kill” into self defense, just wars and capital punishment. I dont know why the other commandments would be excused from similar development.
Generally, progressives are progressive because they think things can be handled better than they are now. Sometimes that means taking an existing law, and identifying exceptions to it. Eventually the law changes to accomodate the many exceptions. There are other ways this can happen- internal forum, legal leniency, etc.- but development seems to be the most honest. Projecting your fears anto progressives, or any opponent, is rarely a good idea.