Earlier quoted context omitted.
As a native speaker I refuse to say 'these data' or the word datum. I prefer 'this data' for plural and 'this piece of data' for singular. Yes I know its wrong in some sense, but I think that ship has sailed
I've also seen "data point" used when a singular form is required. I think in common usage, "data" is a mass noun like "mayonnaise" rather than a plural.
Were you also commenting on its pronunciation? I'd instead say: "data" is a mass noun like "mahyonnaise" and "tomahto sauce".