My very limited exposure to the EU research funding world suggests that it is customary (at least in applied CS) to massively overstate the potential benefits a

My very limited exposure to the EU research funding world suggests that it is customary (at least in applied CS) to massively overstate the potential benefits and scope of your project, and it is understood/accepted that you will backtrack when reporting progress (or even already in the detailed description of what work will be done). Unfortunate, but it probably means that your comment is valid.