Wait and see, he himself said in March/April that the cost development regarding our offer would "be within limits" because he had calculated well and maintains long-term supplier relationships.
If it "only" ends up being 40k € in additional costs, I'll open a bottle of champagne :)
Of course there are price increases, but 40k€ additional costs within 6 months require a good explanation from him.
For example, the steel price has been dropping for weeks and is currently back at the level of the end of 2021. (About 1,000€/t. It was already at 1,600€ in April.)