I think you're reading the exponent wrong. 10 times the mass of the sun where we generally get a neutron star; 9 times the mass of the sun is too light, so we

I think you're reading the exponent wrong. 10 times the mass of the sun where we generally get a neutron star; 9 times the mass of the sun is too light, so we get electron capture collapses; lighter still, and down to one times the mass of the sun (10^0 solar masses, the origin of the log-scale x axis) is where we get white dwarfs.