One thing you have to remember, is even though the tree is gone, there is still residual root competition going on where the tree roots starved the grass roots of nutrition. You need to aerate the soil, use a surfactant too, and amend it with peat, mushroom compost, sand, and topsoil. Then feed the nutrients back into the soil with high phos starter fert and humic acid. Bermuda does NOT grow well from seed at all, plugs or sprigs will do better. Renovation with sod is the best, but then you could end up with different variety patches of Bermuda. Definately do a soil test, but I can tell by the soil color, it is acidic and needs lime. Also, we are entering heat stress and drought season so new growth needs water. A good soaking every other day should be sufficient. And tell the HOA to stuff it.