I believe Premiere Pro still cannot speed ramp footage AND the audio as well! Making it sort of pointless for most speed ramping tasks.
The second you speed change video and start ramping, the audio stops reacting and no longer changes. The amount of times I've tried to fake the audio sounds by splicing it 50 times and attempting to do it manually makes it very frustrating. Most of the time now I just decide to do it in After Effects and ignore the speed ramping feature in Premiere all together.
This has been a feature in After Effects for like 20 years!!