Most of the War Thunder leaks just aren't. What frequently happens is that people go and dig up a manual that's published openly in America but controlled under ITAR (I think), post it, and Gaijin delete the post and ban them because it's technically illegal to "export" the information and trying not to get involved in crimes is usually a good idea.
Then, because "someone's leaked classified data on War Thunder again!!!" is a standard story that you can publish with zero effort and get lots of clicks on, people post formulaic articles about it. But it's nothing that would be of any use at all to actual spies, they can just go on the internet and read the manuals themselves. Nothing like as spectacular as the actual classified leaks, which were incredible but have not been anywhere near as common as people think based on reporting.
