He has stated that he is a "chemist." 1) In the UK, a chemist is a druggist, pharmacist, or pharmacy tech. 2) My father was a chemist, yet he would have never claimed to have any special expertise in any other field of science. My oldest son and my husband are also sci-guys: engineers. Once again, they would never claim to have any expertise in any other branch of engineering other than their own.
But the #1 reason why we know Tom is not a scientist? Because scientists formulate hypotheses, then collect data seeking to either confirm or deny the hypothesis. They then share results with other men/women in the field who then attempt to either validate or invalidate the conclusions reached. Tom comes up with a preconceived bias, then scours the web for discredited scientists and non-scientists to confirm his bias, then insists that he's right and everyone else is wrong.