Because they are lying and also because being able to put %50 of your defense budget into maintaining 5/6ish 5th gen meme fighters when your enemies have thousands of 4/3rd gen fighters is a stupid defense policy that even the Iranians are too stupid to adapt.
The whole "5th gen" is a forced meme by BEA systems to justify their treasonous waste of military resources.
The jump from biplanes to monoplanes is a true evolutionary advancement in aviation, a slight variation on modern jet design is not a whole new "generation" it's a marketing gimmick.
This is exactly the fucking reason why governments shouldn't rely on private corporations for armament production/research unless it's absolutely necessary.
Sure government arsenals can waste money on ideas and concepts that don't lead to anything, but there hasn't been a single privately owned armament production company that hasn't had to rely on government subsidies to survive in peacetime, so if they're basically funded by the government, why not just eliminate the shareholder aspect and just take control of your own fucking arms production?
That doesn't even mean you need to have state owned production, history has shown that with the right management, a "private" company that has complete accountability to the government (and thus, by extension, the tax payer) is far more effective at producing/researching arms than any fully shareholded private company is capable of.
When you fuck up a project for a privately owned arms corporation, the worst that can happen is a bad investor report and you get fired only to be hired by a different armament corporation.
When someone fucks up a project in a state funded armament corporation, they get accused of treason and investigated to the fullest extent that it can be done.
Which one of these methods do you think is best for ensuring proper and useful/cost effective research into arms?
HINT it's not the one that has kikes involved with it