Use the new cell.NewDataValidation, it's faster.
The link you provided doesn't say insert empty rows, it says that [if you're going to inserte rows] don't insert them one by one, insert them all in one shot. There's no need to insert empty rows if you don't have to.
The link you provided doesn't say insert empty rows, it says that [if you're going to inserte rows] don't insert them one by one, insert them all in one shot. There's no need to insert empty rows if you don't have to.