It means that the Trust don't agree with KT and DB's valuation. You only ever pay for anything if you value it as worth the offered price.
Then they don't have the funds to buy it. KT and DB do not have to sell. KT has stated himself that he will only sell to someone he believes has the best interests of the club at heart. I'm not saying the Trust don't, as as supporters first, they obviously do. That doesn't mean they have to sell for less than they see it as being worth though.
At the end of the day, if the Trust and the football club aren't able to negotiate a price that works for both parties, the sale won't happen. That goes for any other interested party also.