Federal law supersedes State law ONLY when the Constitution grants FedGov that authority in the FIRST place. These alleged law professors need to be fired.
It’s on a par with the notion that a treaty can somehow trump the Constitution. No way the Founders were that dumb and/or naïve.
Treaties of the time dealt with relationships between countries, the rights and privileges that one country’s citizens would have while in another or while dealing with another. They did not reach into the internal matters of a country and mess with natural resource use, labor, manufacture, endangered species, migratory birds, air quality, climate change, transportation and every aspect of commerce.