Nourrissat (never heard of him) seems to be your typical high-level club player, who basically only plays a few futures tournaments in France, playing mainly league tennis and money tournaments.
He;s ranked -15, which the ITF equivalency chart puts at 1.2 in the LTA system.
But, presumably because the French have so many more players, the 1.2 UK ranking equates to three distinct French ratings (-4/6, -15 and -30), a sort of high 1.2, mid 1.2 and low 1.2, if you like, with him at mid 1.2.
Perhaps more accurate to say that Dave is now a hold down rather than a break down. He is serving at *2-3. The Frenchman has held once and all the other games have been breaks.