It was discontinued. That was the first, most important step.
What that company did was like damming the flow of a stream, in this case a stream of talented people flowing from entry level positions to the final stages of their careers. The system allowed unqualified male employees to bypass the obstacle while the qualified female employees pooled in ever increasing number behind the barrier. Once the dam broke, a flood of highly qualified female employees began moving through the system again. Having no real competition qualification-wise, they got all the promotions in their departments for the next few years.
Big problem here:
The dam broke long ago. The flood is long past and never was as universal as you think it was anyway--simple probability would show there would be some more qualified males. The wave would have been mostly female, not entirely female.
That was not 'punishing' men. The women who'd been held back got those promotions due to their hard work, commitment, skill, and talent. They were the obvious first picks for promotion. That much could be seen even before the dam broke.
You are assuming all the most qualified were women. That's false.
There may be some little dams scattered about in the labor market but most of the qualified women will figure it out and change jobs--there will be no substantial buildup behind them.
