I think the line is fine, personally. It feels like Kylo is genuinely unhinged at that moment and is expressing disbelief that there is more to the report, regardless of what it is. It could reasonably be expected that the First Order would interrogate those on Jakku to find out about Rey, and this report is given to Kylo before he reaches Maz’s castle along with the report by Kanji Club.

Sure, you could imagine that there is a backstory to Rey that motivates this question, but it can be interpreted either way.