That blog post was made of Sept 29. While the Tonle Bassac hasn't dropped perceptibly the flow is visibly, and quickly, toward the Mekong now, whereas, when the blog post the made, the water was 'stagnant'.
I would expect the torrent of water draining from Tonle Sap will cause a fair bit of erosion as the speed picks up. If the Mekong stays high the water will drain more slowly and less problematically.
The tour boats perched just off Sisowath Quay, a few hundred meters north of the main tourist area, have their bows situated above the cobbled riverside walkway. It's a very odd sight.