I haven’t launched yet and haven’t enquired, but it hasn’t changed much in the last couple of years and my unattributable advice is that it should be OK in the channel as marked, certainly above half-tide.
I went through a few weeks ago, and just followed the buoyed channel as usual without any problems.
Later PS! I should mention that I went through within a couple of hours of High Water, but I draw 1.6m and have a fin keel, so I don't take chances in an area like that! However, I had at least 2m beneath the keel at all points through the passage.