When I did have a quick look and feel underneath the car, the bar felt connected as far as I could reach either side of the tow bar. This confirms what Paul says, and also means a b***er of a job removing it.
As there is nothing in 'the' Haynes manual regarding tow bars, and I have no owners manuals, I am guessing that the big bumpers come with some kind of more solid bumper iron behind them for protection/defense, and that this in VW tow bar form is identical but with the ball/hook as an integral part of it. If it wasn't raining so much and so hard I'd probably go outside and have a proper look, but it is, so I won't.
I guess that it is there to stay until a cheap replacement bumper and iron come up for sale. (there is one on ebay now, now but I don't have the time or spare cash.)