In other words, the FBI scientist just made up the new claim that the anthrax was not so high-tech that it had to have been made by a government-sponsored bioweapons program.
So why did the FBI change its tune, based upon an unsupported statement by one of its scientists?
Well, if the evidence pointed to state-sponsored terror, ruled out states the U.S. government wanted to blame the attack on (such as Iraq), and actually pointed towards America as being the "state sponsor", the government might want to distract people from the true culprits, right? Especially given that producing weaponized anthrax violates laws to which the U.S. is a signatory, and could constitute war crimes, right?
Indeed, on September 4, 2001, the New York Times revealed that the government was going to produce a highly-potent anthrax strain at a military lab in Ohio.
And Dugway Proving Grounds had been producing high-grade, dry, weaponized anthrax for quite some time before the attacks, and had shipped Ames strain anthrax "back and forth" with Fort Detrick.
Since 16 labs and many hundreds of people had access to the exact strain of anthrax used in the attacks, a state-sponsored operation could have been set up almost anywhere in the U.S.