Huh? The anthrax attacks occurred nearly simultaneously with the 9/11/01 terrorist attacks. President Bush was in office just over seven months at the time. So if by "this" you mean the attacks, you're incorrect. If you mean whatever occurred to enable manufacture of the anthrax, you're probably right, although without any solid evidence to go on, no one can know for certain.
The FBI thesis is complete if and only if the manufacturing is done well before 2001.