I do not think this is true. Bear in mind that Chevron dealt with agency deference in connection with agency jurisdiction, where the organic statute was considered to be ambiguous as to agency jurisdiction. The Chevron overturning does not, at least directly, curtain agency deference with respect to the substance of legislative regulations that are unambiguously within the scope of agency jurisdiction. That issue, rather, implicates the anti-delegation doctrine, the demise of which I hope one day to see, but hasn't occurred yet.MA AWB case that was ruled constitutional using Chevron. It was appealed all the way up to SCOTUS but was refused because, at the time, they wanted to take Bruen. Now, there is an opportunity to request re-hearing with SCOTUS due to an invalid decision using Chevron. SCOTUS will kick it back down and invalidate the lower court decision. The lower circuit will have no choice but to overturn the AWB just like it did with "may issue" after Bruen decision.
Magazine capacity from RI was another one. Chevron was used to rule on almost all 2A cases that were argued in the first district court.