"Our management has performed an analysis of our ability to continue as a going concern and has identified substantial doubt about our ability to continue as a going concern. If we are unable to obtain sufficient additional funding or do not have access to additional capital, we will be unable to execute our business plans and could be required to terminate or significantly curtail our operations."
Almost any startup will have periods where there will be "substantial doubt about our ability to continue as a going concern" if they are "unable to obtain sufficient additional funding". This is meaningless when looking at a startup without also looking at whether their burn rate is abnormal relative to how much they raised, and whether or not they're meeting their targets.