Correct, but 100's of Audio Sources for your UI is not efficient, so you'll want to build a better solution to work around this new issue.
If you are using this for your UI then you might consider making one or mode Audio Sources and when you need to play a sound just target that Source, change the clip to the proper one, play the Audio Source. For sounds in the same category (like Hovers, Clicks, etc) you can use the same Audio Source, or just do it all on the same one if you don't care if it overrides the currently playing sound.
That is super efficient, but requires a bit more work on each state needing to do this. (several actions for each one)
To take it another step further to optimization you could make a Template to do this for you, then just use Run FSM and input the necessary variables for it to fire off which would make it significantly easier to maintain.