I have heard from people that the ability to play audio from a timeline is reasonably in sync, but I don't know exactly how the feature is being used.
Truth is that relying on the timeline play head and the audio that is playing to be in sync is not adviced, if you are looking for high accuracy that is. This is because the timeline basically just acts as a trigger to start playing a sound, after that the audio and the timeline continue doing their own thing separately and parity is not guaranteed.
The audio tracks serve more as a visual aid to better control when audio will be triggered and as a general guidance on to how long the audio will be playing for, relative to the total timeline time.
Having said that, you can run your own small tests with the feature and see if it will work for you.