>Did Qubic really attack Monero ? No, according to official statements, it was a planned stress test to identify vulnerabilities in the Monero network.

"not really a nefarious attack" is an insane summation of this article. There's zero way for someone outside of qubic to verify that they didn't do something nefarious while controlling the network. Stated another way- anyone could call their 51% attack a "stress test"