It's not judicial supremacy other than the constitutional authority of the courts to interpret the law. Congress still passes the law - if they want it to be interpreted differently, they can just be more specific. In this case especially, it improves checks and balances - judges will check the executives, instead of executive-appointed quasi-judges with obvious incentive issues.
Frankly while I don't think the "originalist" interpretation here is correct, clearly early congresses delegated broad and vague authority to executive in various matters, I actually think it's one of the weaknesses of the original intent of the founders. I assume, given that the early American elite was a relatively small group of people with a lot in common, they didn't foresee the need to micromanage each other in such matters.
Now that executive employs millions of people, I think it's necessary. Like, when CDC can suspend probably the most common private contract in the country (rent) under the delegated authority to fight diseases, this is a step too far for me; and even if you don't think so, what would you think of China-style extreme lockdowns? There needs to be a way to draw the line over vague delegation of power. If IMPROVES checks and balances - judicial can check the executive. Congress can still explicitly give executive the authority it needs and override the judges.
Same for NLRB - pass labor law as the normal laws that the normal judges can interpret.
Next stop, make Commerce Clause unimportant again ;)