Yea, I would agree with you on this. It's too easy to get into trouble with this bike if you don't know what you're doing. I remember when I first got mine, some of my friends that owned Harleys (and had been riding for 20-30 years), rode mine and brought it back saying "it's too much bike". One even said, he was "afraid" of it. This always made me laugh, because I know that I control the throttle. Regardless, for well-seasoned riders to question the ability to comfortably ride this beast, I would be very wary of a new rider that wants "write checks he can't cash". Especially when that rider is my son.
Obviously some people learn more quickly than others, but in my opinion a month of riding, no matter how many miles, does not prepare someone enough to effectively control this bike. The real question is "when will he be ready"? That answer is quite a bit trickier and only you can answer that through observation.