It was designed by engineers to be quantum resistant without enough deference to mathematicians who could see that it was not resistant to more conventional approaches.
That is true only in the banal sense that any number-theoretic crypto break can be attributed to paying insufficient attention to mathematical research, but isn't true in any useful sense, since a small army of mathematicians worked on isogeny Diffie-Hellman.
> It was designed by engineers to be quantum resistant without enough deference to mathematicians who could see that it was not resistant to more conventional approaches.
Ie, they didn't take enough time and money to consult with every cryptography and mathematics expert.