Back when I saw this move I was expecting David to play 14.k15 instead of 14.k11 such as 14.k1515.k1816.n1517.i1718.i11 and now black owns the left upper quadrant. Without the threat of k18, black also has good chances to connect to the right lower quadrant.
The bot also thinks David was still winning until move 24. Instead, |24.p9 25.n12 26.m6 27.l8 28.o7 29.j7 30.g5