Try again Viscount702, see if you can find seat row 13
In fact I can't find row 17 either. Fell into that trap.
Therefore 23 rows in total giving 138 seats on the plane.
LH seat plan shows 6 rows of business giving total seats of 126.
seatguru.com shows the maximum of 8 rows of business giving total seats of 122.
This still wouldn't account for the increase.
If they cut out business completely that would come nearer the figure but I don't think they would do this. Therefore we can't see where this increase is coming from at least not yet. Probably an error by whoever wrote the article.