This would be a total estimate but gauging from the picture, if the scale stays linear, it looks like it's floating about 45 gravity pts below the 1.170 mark. So 1.215 ish starting OG? If it fermented to around 1.154, using the brewer's friend calculator for higher gravities that gives about 9.33% ABV. Mead yeasts would usually go higher than that but given that extreme starting gravity not surprised that it wouldn't get very far.
Edit: correction the Brix of 36 is about 1.158 to finish, and the ABV using the higher gravity calculator looks like around 11.29%. So in range of tolerance for a sweet mead yeast.