Interestingly, the source you provided for the 90% decrease in energy consumption for self-drving cars but also describes a scenario for a 250% increase. Mostly due to new, additional user groups, if I understand correctly.

However, we all don't know how COVID will change our behaviour regarding commutes. I'd guess that could also save a lot of energy, see here: https://daliaresearch.com/blog/the-countries-with-the-longest-and-shortest-commutes/