Yes Tiva fixed a bunch of issues with the Luiminary.
My guess is they changed the name because the chips were horrific, TI seeded us a bunch of dev boards and I recall being super excited about using them since they had such a great feature set, but darn as i mentioned, the errata for those chips just made them pretty unusable, at least for us.
The Tempest /Inferno LM3S were at least some of the ones with flash corruption and were discontinued.