Isn’t the headline a bit misleading?
Juno will reach those speeds for sure, but only because of the gravitational pull of Jupiter, not of its own propulsion.
Still, it’ll be mighty interesting to see what we can learn from this probe.
I think it’s a testament to the number crunching capabilities of our modern computers more than anything else. The ability to launch a device from the Earth, get it into orbit, and sling it across the solar system with the help of gravity takes a lot of very precise math.