A military isolationist or an economic isolationist? If he does support trade protectionism and limits on immigration, it contradicts his support for capitalism and the free market.
He doesn't support protectionism and he supports legal immigration. He also supports freedom of movement out of the country, so he's not an isolationist in any sense of the word.
An isolationist is a protectionist white nationalist who puts up machines guns to secure the borders from everyone and everything, from letting the people travel, to free trade, to immigration, although that includes keeping the military in the country also. Lincoln and Hitler were Isolationists for the most part other than the fact that they ordered invasions. Jefferson was being an isolationist when he pushed for the Embargo Act. Madison was probably a complete isolationist.
Ron Paul supports states' rights, but he believes that national sovereignty is better than global governance like the U.N., NATO, etc.