I have posted this a few times over the years. If you are bound for the Kimberley, and the above experience is on your bucket list, take note.
When I lived in Derby, quite a number of visitors commented/complained that the waterfall, wasn't "running" and they had paid a truck load of money to get there.
If you are going all that way to see it, then be sure that is "running"
When booking, be sure to ask if the tide is "with you" Don't take "Should be" or any other stupid answer.
If the booking place reckons it's OK, then ask, if it's not, do you get a refund.