Now that's an immature thing to say - and in no way even necessary in this context here.

You yourself were a productivity "guru" espousing flow states and working 8 hours to write 5 articles in a row.

(Nothing wrong with that at all - it's inspiring actually).

But saying Tim's gf must have left him just because he was uber-productive is B.S. - and reeks of self-righteousness.

Make your point - without putting the example person down