Mugabe's nephew, Patrick Zhuwao recently claimed during an interview with Voice of America that his uncle was being "ill-treated" by Mnangagwa's government.
Moyo told the BBC that "it is not illegal to support Grace Mugabe".
This would be his first official visit to Namibia as Zimbabwean president since taking over from former ousted president Robert Mugabe.
"Right now the cabinet of the Republic of Zimbabwe is led by the most feared people in the history of this country".
The Namibian presidency confirmed the visit to Namibia by Mnangagwa - who ascended to the presidential throne in November 2017 - following the resignation of then president Robert Mugabe.
Calling the takeover "unconstitutional", Moyo went ahead to describe the manner in which he fled the country, which accorded to him was because of a "death warrant" issued by the military.
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Mugabe resigned after weeks of uncertainty in Zimbabwe, catapulted by his sacking of Mnangagwa as one of his vice-presidents, in what was widely reported as a covert attempt by the veteran statesman to pave the way for his wife Grace to succeed him as president.
Mugabe, 93, stood down last November, a week after the army and his former political allies turned against him, ending almost four decades of rule marred by allegations of corruption, human rights abuses and economic negligence.
The pardon was also extended to terminally-ill prisoners and those sentenced to less than three years who had served at least a quarter of their time.
Moyo said he fled his home in Borrowdale after receiving a tip off not to spend the night, on November 16, at the house.
"I would rather be hated for standing for my principles and believing in the rule of law than be feared that if people don't agree with me I will unleash the tanks".
But according to the state-owned Herald newspaper, ZACC's patron Jimmy Muduvuri dismissed Zhuwao's claims, saying that Mnangagwa was a caring president. He and Moyo, along other members of the G-40 faction were banned for life at Zanu-PF's national congress in December. He says the situation has changed in Zimbabwe since 2013, when a new constitution was enacted.