I used my limited math skills to determine that 2700 kg of paper is equivalent to 298 boxes of paper with 5000 sheets per box. Or 1.49 million sheets of paper. Divide that by two for English and French submission that's still almost three quarters of a million pages to support their bid.
How can this be justified?
It depends how the requirement is justified, every technical point needs to be stated to be either demonstrated or proved to meet a certain capability and standard. The technical points can boil down to incredibly similar things but need the contractor to show "yes, it can do this" in case something messes up.
It's risk aversion but it's not unreasonable considering the potentially lethal consequences. It might be something like 'can X operate in environment characteristic Y', but then it operates in environment with a similar Y+ characteristic and it breaks. It's the Govt's ass on the line then, when they could ask for Y, Y+, Y- and Y2 which all need to be proven.