Those who call it a partition are more accurate than those (myself included ) who call it a bulkhead. A structural bulkhead would have been tabbed in. In fact, this partition floats with no structural attachment to the hull.
A proper bulkhead would have been tabbed in with fiberglass mat, tape and polyester resin to the side of the boat. The part which is structural, is the V berth platform and the area where there is a floor in the center of the V berth. This floor and the V berth platform are only tabbed in at the aft end, and along the sides of the hull. They do give some support and rigidity. I have seen boats which have been abused, where the tabbing had broken loose from the V Berth platform.
It does not show well in the photos, but the wooden block the fan is attracted to, is epoxied to the hull and there is support for the "Dashboard" or what you want to call it in front of the navigators' seat. That is not really structural, but does give support to the hull.,
Why the lag screws--no idea--I have seen a number of them loose, worked with time.
Conclusion no structural support. My thought is if you want cozy or privacy, then you can put a cloth curtain there. I enjoy the extra length and there is less "footsie" with our partner at night...