His work also lines up nicely with the DEC Alpha, early Athlon/Opteron, and Apple A4/A5.
With no malice, I'm not aware if anything of significance came from his time at Tesla.
It will be interesting to see if AMD can keep things going past Zen 3 next year (which is likely to be the end of Keller's direct influence), and also what Intel can do with his guidance, which I would expect to release sometime in 2021-2023.
Tesla not long ago presented their impressive in-house neural network processing chip. Quite likely, that Keller was an important contributor to this. So there would be quite some significant outcome from his time at Tesla.
Some say Jim Keller's work at AMD lines up nicely with AMD's resurgence.