Toon's move for the Frenchman has been questioned after he turned them down in January.
But Bernard told the Evening Chronicle: "Newcastle fans are yet to be convinced that going for someone who seemed to say no to the club having said yes a few days previous is not the greatest idea.
"Remy went to QPR, who were all-but relegated, because they offered him more money. A lot more money.
"That's hardly a secret.
"I said at the time that it was a mistake and that I was also disappointed.
"I know Remy well. I believe him to a top class player who would have fitted right into the team."