[kra34]

From a random internet site: " The data are correct.

But most people treat 'data' as a singular noun, especially when talking about computers etc.

For example:-

The data is being transferred from my computer to yours.

And I have to be honest, I've never heard anyone ask for a datum. "

It could be the case that the scientific pluralization is leaking into regular usage because more people are collectively reading / reporting on scientific studies. Alternatively, Google / Grammarly and similar tools might be suggesting it because it's been seen in their training data / examples.

In any case, IMHO 'datum' is a singular point of information, any reference to multiple points of information would make the noun plural.