This is a purely legal argument in the original German report. I don't understand the legal aspect here, what the report says is that due to constitutional law

This is a purely legal argument in the original German report. I don't understand the legal aspect here, what the report says is that due to constitutional law an extension of the runtime of the nuclear reactors would require a risk/benefit analysis. And a higher chance of attacks or sabotage would increase the risk here. The only thing the report says here is that this requires risk/benefit analysis would need to take these factors into account.