Plus, the 450TH/s hasharate estimtion for September is very optimistic. He is counting on no Avalon chips hashing by September, which seems unlikely.
But hashrate estimation is a total black art - there's perfectly legitimate community members (afaik) who've come up with similar predictions
https://bitcointalk.org/index.php?topic=232670.0 It's hard to avoid the feeling that you've got an axe to grind over this - I just wish you'd say what it was.