unless Democrats pass a law guaranteeing access to the medication.
Why would that hypothetical law (which won't get passed: see their promise to protect Roe v. Wade) not just get overturned by SCOTUS? They clearly play by their own rules.
If anything, your link to the Ivermectin case thing is further proof of that.
The fact is that a Democratic presidency and legislature can do nothing in the face of a Supreme Court that they still view as wielding discretionary power of them, and Democrats are too weak to play any sort of Constitutional Crisis hardball.