Re: data is a plural word
A few things to bear in mind:
Nowhere does the article refer to a single point, but always to a collective "data".
In English, "data" is also used as a collective singular noun.
In English, datum generally refers to an originating or prototypical example of a thing. See for example "datum line", generally shortened to "datum", being a guaranteed line from which measurements are taken or from which distance is calculated in a variety of fields.
Datum might be the latin singular and data the plural, but we aren't speaking latin. My wife speaks classical latin and has taught it at a university level, yet she'd bop you over the head with her copy of The Golden Ass if you tried pulling that sort of pedantry on her. Attempting to shoehorn latin rules of grammar into English is the reason why we have to put up with complaints about split infinitives and the tortured house style of The Economist, that once rendered the unforgettable sentence "Yet even as big data are helping banks, they are also throwing up new competitors from outside the industry." Which is a complete and utter nonsense.
And finally: language evolves. Words change meaning. Often they can change quite fundamentally and even transform into antonyms of their origin, as you might find if you look up the historical meanings of "nice", "artificial" and "awful".
Data is the singular, plural and collective noun in English. That's not how it started, but that's what it is.