All the criticisms you mention concern the responsibility of others and do not reflect on the work you have put in (expected scope change, deadline changes) so

All the criticisms you mention concern the responsibility of others and do not reflect on the work you have put in (expected scope change, deadline changes) so it sounds like there is a communication issue between your manager and the boss. It was therefore ‘unfortunate’ they werent at the meeting. I don’t see how you could have produced anything more based on your account. Perhaps you’re able to reflect similarly. Besides remind yourself you are all working towards the same goal and put your best into the job, projects are never ideal, that’s ok