Kane has scored just once in his first nine Premier League appearances this season, and questions are being asked of his ability to repeat last season's heroics, where he netted 31 times in all competitions.
Against Liverpool, Kane missed a couple of decent openings, but Redknapp feels that any criticism he has come in for has been unfair.
"I thought he held the ball up great," Redknapp said. "He had a shot late on, that was a good opportunity for him, but I wouldn't criticise him. When the ball came up to him he made it stick, but he didn't get enough support.
"He's a real good player. He's not just a one-season wonder. This kid is the real deal, I'm telling you."
Tottenham's match against Liverpool was one of limited chances, and few could have described either of Kane's opportunities as clear-cut ones.
The striker had a shot from just inside the box in the first-half which was well saved by Simon Mignolet, and the Belgian goalkeeper also denied him late on.
Last season they were chances that Kane may have scored, but Mauricio Pochettino has little choice but to persist with the England international.
Tottenham have a lack of other options in their squad to fill the central striking berth, with Kane required to shoulder much of the side's goalscoring responsibilities.