I'm not sure if I'm going to believe this or not. It probably because everything can be manipulated, it might possible that they just want to trick investors of being hacked but the truth is that their project has nothing to show good.
Well, I'm not good with DeFi and since from their launching, I have no interest to invest them knowing that many of them (almost all) are just shit projects. I can't really imagine how they create such hypes? However, the quickest they rise up, the fastest also they dump and even becoming dead.
Yes, possibly, inside job. Wondering how a flash loan can surpass the strict requirements of defi platform? Unless, they know where to hit the vulnerabilities of their system. And to know where to attack, of course, somebody inside have the knowledge about that. Really a lesson for those potential defi investors, not to trust fully the platform they are using.