As the author of that piece, although I have been known to reply with humour at times, everything written is straight up, NO jests. If it sinks, it's GONE and if you have a look on one of the Sat. sites, you can see how big it is.
One of the problems was dumping a boat in the water as the water level was about 15 -18 inches below the top of a wide stone block topping which extends round vitually all of the perimeter. Walking round recently, if you enter from the directions I've given, when you get to the lake side, look across to the right of the Island and there is a concreted area that used to be staging point for hire rowing boats and was all those years ago fenced off, is now fully open and would be ideal as a launching jetty.
Be warned, it's deep AND cold.
Regards Ian.