Before the framework change, if a unionization election has started and the employer attempts to union bust, the election would just be re-done.
Now, if an employer attempts to union bust during an election, the election is dismissed and the NLRB will automatically order the employer to recognized the union and to begin negotiations.
This is a huge boon for unions. Now union busting is heavily disincentivized and even counter productive for employers and it is much easier to unionize a workplace!