Well in this case you certainly can. Someone who doesn't want to be identified while making an argument clearly doesn't want to held accountable for their claims. But science depends on reliable sourcing and verification; someone who does't want to play by those rules can be safely ignored.
Anyway, I can make a good probable guess as to why, and it doesn't do any favours to the idea of taking him seriously.
that may be , but if you dont watch to the all thing you cant give a formulate opinion about what he is saying . Listen to the man 1st then judge him all you want .