The wires from the street into the breaker box are often aluminum. That is in an inhabited structure. There are 100 million houses done that way, and these wires don't cause problems. Aluminum can be safe if done correctly.
There were millions of houses built with interior aluminum wiring not done correctly. A few burnt down. That's a good reason to be very shy of aluminum wiring, especially in houses built in the 1960's and 1970's. But a new house? I'd be skeptical, but would consider it. Show me the test data. Show me houses built with this technology that have been around for a decade or more.