There are a lot of options in explaining this; megalglin zchus al y’ddi zachai, etc.. is one mahalach. Another is that we don’t know his intentions; why exactly did the Yemenite jews need help? Because they were poorer than Jews in tel aviv? Why did he take a sudden interest in their non-existent plight? Maybe he was a Christian zionist who believes that jews need to return to the land for their false messiah to return.
Maybe he actually meant well but should have looked into the cultural erasure (to use a woke term) that the zionists were doing to sefardim and everyone else (yaldei tehran, etc)