Re: Seller agreed to offer, but set a clause,"no discounts after survey"
I agree the clause is of no particular effect, I'd proceed. Any post-survey reduction in price is always subject to negotiation, clause or not, and the buyer has an absolute power to say NO. to a reduction.
Even with the clause, you want a reduction for cause, the seller has to make the same decision they would, without the clause. I'd call it just a little gamesmanship, ignore it.
Certified...in several regards...