Not exactly true. Any of team that sends assets to acquire Lauri, will be given the all clear from his agent that he will resign for the max. If the Spurs want him for le runs over the next 5 years, Spurs need to trade for him.
At the same time, if the Jazz don't trade him, we have to assume he has agreed to sign a max with them in the off season. In saying that, if there is any hint he won't, the Jazz will trade him for the best offer.
Edit, if Jazz are 'listening to offers,' the assumption is that he is not 100% committed to the Jazz. The Jazz will have to weigh in the offers and compare to resigning him, with the risk of losing him for nothing, re PG3.