Every language has idiomatic expressions that mean something non-literal.
You can turn on a light, turn off a light, turn in a criminal, and turn down the covers without ever turning anything. It’s just the way the language works.
He made available his research and He make his research available means that he allowed his research to become available. Available is an adjective in both sentences because made serves as a quasi-linking verb—because made available is an idiomatic expression.
When a house catches fire, it really doesn’t catch anything. It ignites. Same principle.