The Bafana Bafana legend feels it is apparent that injuries were forcing the former Mamelodi Sundowns star to manage his workload.
"This boy yes he's injured, but it's only a strain because we haven't heard anything from the medical doctors," Buthelezi tells KickOff.
"Broos mustn't come out to justify his injury as Tau doesn't want to play friendly games that's it.
"He's got an agent who doesn't want him to play friendly games,
"If you look at the ratio of the games he played, which are very important, and some we've lost, remember each time you lose a game when you are a top-earning player it gets into your mind.
"As someone who is expected to create and score goals there is no way he will not get injuries, look at Karim Benzema he is nursing an injury as we speak.
"You must remember Tau is playing in Egypt, land of the slaves, they don't care much about black people.
"So if he is not performing well they gossip about him in the Arab language.
"Coming into the invitation from the national team, surely he will never take it because he needs a break.
"Tau is being currently shadowed by the agent, and also protecting his career because the national team doesn't give him much than the club, this takes us back to club versus national team.
"Tau's injury has been caused by the fact that when Egyptian teams mark a black player it's as if he's a prey attacked by wild dogs.
"So the agent is helping him here because she can see this is taking its toll on him.
"So Broos better focus on the locally-based players, 99% of the squad that won the 1996 AFCON were based locally, how many players in that squad were from Orlando Pirates?"
Contacted for a comment Tau's representative Mmatsatsi Sefalafala told this publication to call on Thursday afternoon, but could not be reached on his phone when the time arrived.