No, their first paragraph was a prediction. Their second was a assertion of fact without any evidence provided. They could have hedged that statement with "I think", or "in my opinion", but instead they went with "They're wrong; full stop, no qualifications, no asterisk, no footnote, they are totally wrong on this". Strong assertions require strong evidence, and not providing that evidence deserves to be called out. At least that's generally the consensus of the community here, as I see it.