Before proclaiming that this outcome is horrible - Please consider that the Good Guys (your opinion) might not win the election in November. And that you might not want the courts auto-deferring to all the plausible-ish interpretations of ambiguous laws which gov't agency officials appointed by the Bad Guys (your opinion) might suddenly add the Official Agency Interpretations next year.
Regardless of where you are on the political spectrum, this is going to cause a practical mess just like the Dobbs decision, except Chevron deference impacts every area of federal regulation.