Is the use of "isomorphic" in "isomorphic javascript" that far off? You're mapping [program, output] pairs from one environment (client) to another (server), ideally creating the same structure. Isn't that an isomorphism? Sure to be mathematically rigorous you'd have to jump through lots of hoops, but the context is closer to Hofstadter's use than abstract algebra.

I'd argue that usage is more "technically" correct than David Chang, who's referring to the _entities_ as the isomorphisms rather than the relationships between them. (Though I understand his usage and find no problem with it in the given context.)