I mean, look at the first bullet point. George Washington signed a bill passed by a Congress made up of people who wrote and signed the constitution that required people to buy guns. If the individual mandate is unconstitutional, so is one of the very first laws, signed by our very first president, written by the people who wrote the constitution.
No, that law was to conscript men (in times of war) into the militia, where they would be required to bring their own equipment (hence a militia). That was justified under the power to "raise and support Armies," not the commerce clause. In fact, IIRC not a single law cited the commerce clause until well into the 19th century. This sort of argument that comes from the left is pretty much outright lying.
