This Supreme Court is, and always has been, political. The idea of the "textualist" or "originalist" interpretation of the Constitution as a philosophy is just propaganda invented in the 1980s shortly after the Federalist Society was founded.
This court seems determined to overturn Chevron [1], which is the basis for deference given to administrative bodies empowered by Congress, the so-called "administrative state" (or "deep state" depending on how far down the rabbit hole you are).
It's the same politics behind the major questions doctrine [2]. This was an approach invented by this court that basically says in matters of statutory interpretation if the issue is sufficiently large, which is subjective, then Congress needs to be absolutely explicit in the powers granted. This was used to deny student loan forgiveness because even though the exeuctive was granted this power, the Court decided the amount was large enough that Congress had to be more explicit.
Put another way: the legislative branch is overruling both the legislative branch that drafted a law and the executive branch that signed it into law. It's quite literally legislating from the bench.
Chevron is another prong in the attack on executive authority. Instead of deferring to experts in the various departments, Congress would need to decide every matter. So if the law isn't explicit enough (according to SCOTUS) then Congress would need to decide every little thing with new laws.
This is untenable. Congress doesn't have the bandwidth to, say, decide fish quotas or hunting seasons or, more importantly, things like what constitutes "clean water" and the allowed actions to enforce that.
This is a very deliberate attack on government itself. It's a form of deregulation to transfer even more wealth to the hands of the very few. Why? Complying with regulations costs money. That's what this is about.
[1]: https://en.wikipedia.org/wiki/Chevron_U.S.A.,_Inc._v._Natura....
[2]: https://en.wikipedia.org/wiki/Major_questions_doctrine