If that's what you took from his paper, you didn't understand it. He is specifically arguing against DSGE models, a popular methodology for studying business cycles, but one that has been unsuccessful. That is not the same as arguing that all of macro is useless. It's not different from saying that criticism of imperative programming means all of computer programming is useless.
You're not going to take funding away from DSGE models because it's mostly individual researchers writing programs for themselves.
Ricardo Reis argues that macro has largely moved beyond real business cycles with frictions[1]. I'm not as optimistic as him, but DSGE is no longer as prestigious as it once was.