Edit: +6, -3 G ultimate loading on the Golf. Similar, but bit less than, normal category C150 etc if my recollection of limit loads is correct, and using 50% upscale for ultimate load.
Bear in mind the effect of 'rolling G' too. If pulling back whilst rolling (such as a spiral dive), the outer wing will be experiencing a higher 'G' than the occupants in the cabin. This is why it's so important to level the wings before recovering from a nose-down upset.
I'm not suggesting that's what occurred here, just a consideration.