Which means the regulatory body cannot actually make regulations, yes.
Like, the EPA has its problems, but at the very least bribing EPA officials is actually illegal, unlike congress
No, it means that Congress establishes the bounds of what domain the regulatory agency is being delegated authority over, and they can make regulations within that range. Going beyond that range, or making regulations that Congress has specifically shot down is out of bounds. In the case of the SCOTUS case in question, due to an admittedly poorly worded bill the EPA did not have that authority in that case. Pass a bill giving them authority over that and they would. This is way different than saying the EPA "cannot actually make regulations" in a broad sense.
So, for example, the FCC licenses bandwidth for over the air transmissions because that's what Congress delegated to them the authority to do, and they have a swath of authority regarding broadcasting laid out in law. But they have no authority to, say, regulate record companies, despite radio stations often playing songs produced by that industry because that's not part of the authority that has been granted to them.
For another dumb example, the Department of Health and Human Services Office of Civil Rights cannot cancel student loan debt, even though they have authority over policy for implementing and enforcing Title IX. Both are education related, and women hold a majority of student loan debt so it's not sex-neutral, but student loans are simply not in the span of authority delegated to them.
Either you have the right to your own body or you don't.
...in a country where half the population has to sign a document saying they are effectively government property to be used and disposed of at it's will (even if making use of that is extremely unpopular and not currently needed and so is unlikely to actually be invoked for the foreseeable future), that same half of the population is routinely subjected to medically unnecessary genital surgery in infancy, and there's one kind of debt where you have to pay another person (remember: for most people funds to pay things are gained by doing labor with their bodies) and if you fail to keep up with payments you can be jailed (about 1 in 7 who fail to keep up with such a debt end up being jailed at least once, as as the debt continues to accrue while in jail, you can't work while in jail, and employers tend not to prefer people who have been incarcerated if they have a choice being jailed for being behind only makes you farther behind and more likely to be jailed again) .
So, the answer is "you don't, and really never have", but since 2 out of 3 of the things above never apply to people who might need abortions (and the third only a minority of the time) many of them have that illusion.