There was a call to action, not a question: 'please confirm flax contract'. The thumbs up could easily be interpreted as 'understood, will confirm', and persona

There was a call to action, not a question: 'please confirm flax contract'. The thumbs up could easily be interpreted as 'understood, will confirm', and personally that'd be my interpretation, given the situation. It seems especially likely if there wasn't much of a delay before the response was sent (sufficient time to adequately review the contract).