basically I agree, but I would only go the 4 row step 16 times here, since it does not say do it once and repeat it 16 times, but it does say do it 16 times.
does the pattern give any "check up sum"? A number of stitches you are supposed to have at a certain point? then we could calculate it.
In my eyes you would have 19 increases on both sides, so that it 38 stitches more than before the increases start.
If you follow suzee's calculation then you would have 20 increases and 40 stitches more.
maybe that is not critical? what will the project be?