I recently purchased a S25 Ultra from Samsung and traded in my A33 for $75, plus a trade in boost which was around $300-$400.
They have now assesed the device and claim that it has lcd damage, and the new value is $0. My question is if I accept the offer will I still get the trade in boost amount, therefore only loosing the $75? Thanks

I think you're understanding it correctly, you'll lose the $75 device value but still receive the trade in boost amount of $300 - $400. No guarantees from me though sorry