My guess is no - that something in the system is triggered by the fecal transplant but that gut flora isn't the main source, but it would be an interesting thing to look at. I'm not in this field and do not know how to mine this data or properly posit the question, but maybe something along the lines of: "How many people who have taken a strong antibiotic in the last 10 years get alzheimer's vs people who have not taken any antibiotics?" Seems like this data should be out there, right?
Maybe someone who works with this kind of data or research can weigh in. Can you imagine if the cure is that simple? Just take strong antibiotics at an early stage....!?!