He is a former Provincial Secretary of the ANC Youth League (ANCYL) in the Eastern Cape.
In August 2010, Ndabeni was elected Provincial Secretary of the ANCYL in the Eastern Cape.
[3] He resigned from that position in November 2017, saying that internal party politics had placed him in "a compromised position": ahead of the ANC's 54th National Conference, the mainstream ANC in the province supported the presidential candidacy of Deputy President Cyril Ramaphosa while the ANCYL task team had endorsed Nkosazana Dlamini-Zuma, and Ndabeni said that he wanted to "give the Youth League space to articulate their position on issues without hindrance".
[5] In March 2022, the ANC National Executive Committee appointed him to the 31-member interim task team that temporarily replaced the Eastern Cape ANC's Provincial Executive Committee after the latter exceeded its term and was disbanded.
[6] In September 2022, Ndabeni was found guilty of defamation in a case brought by Sitembiso Sicengu, a local councillor in the Eastern Cape.