Duarte did not specify which journalist/s or any media firm that had apparently been paid to report incorrect information about the Madikizela-Mandela.
Malema a former ANC Youth League leader was kicked out of the party in 2012 and established the Economic Freedom Fighters (EFF) alongside his deputy Floyd Shivambu.
The young leader said the late struggle icon treated him as a son and had supported him during his political troubles when he was in the ruling African National Congress, before and after the ANC booted him out as a president of the party's youth wing.
As soon as Malema wrapped up his speech, EFF supporters started streaming out of the stadium. He said: "If it is true that the ANC wants to honour you, let them name Cape Town Airport after Winnie Mandela".
Duarte described Madikizela-Mandela as a caring mother who suffered more than anyone could have imagined when she was incarcerated and exiled by the apartheid regime. At the funeral service held on 14 April at Orlando stadium, Malema visibly tore into the ANC leaders whom he said they claimed Winnie was now theirs yet they disowned her.
Ramaphosa, who was a non-executive director for the mining company Lonmin at the same, called for "concomitant action" to be taken against the miners.
"Winnie Mandela is our mother".
President Cyril Ramaphosa read out and dedicated Maya Angelo's poem "Still I rise" to Madikizela-Mandela, saying it could easily have been written to the struggle icon.
The send-off the country gave Winnie was as good as we have seen and something to be proud of as a nation.
He called on the people of Soweto‚ where she lived until her death‚ to never forget Madikizela-Mandela's legacy. "They just multiply into millions of red flowers of love", Malema said amid loud cheers.
The firebrand EFF leader, who had a close relationship with Madikizela-Mandela, referred to her fondly as "mama" during his address.
"I'm here to look at your grandchildren in the eyes and tell them that they will never be treated like they've got leprosy for as long as I'm still alive", Malema said to yet more loud cheers. He also said that Cape Town International Airport should be named after her.
Malema and leaders of other political parties have also been allowed to be part of the dignitaries to bid their final farewell to the struggle icon at the cemetery.
His refusal to acknowledge former president Jacob Zuma was clearly notable.
Some of the speakers at the funeral included President Cyril Ramaphosa, fashion icon and model Naomi Campbell and EFF leader Julius Malema.