=COUNTA(SPLIT(submission," "))
It's done on the spreadsheet. The formula is pretty simple, so it's probably more lenient than other online tools. As such, so long as it's less than 1000 on whatever word count you choose to use, it's probably fine. If need be, we can switch to something more testable.
Speaking only for myself, I don't mind if a submission goes *a little* over the limit, in my head it's more of a guideline. However, should the situation arise, I'll discuss with Fippe and we'll make a decision on a case by case basis.
In this case, though, it's fine.
Just remember that shorter is usually better