"This vulnerability is so subtle that it evaded years of analysis by expert cryptographers focused on zero-knowledge proving systems"
Reality is bleeding edge crypto is risky; second inflation bug they've had.
BTC has categorically worse privacy than ZEC on L1, but the trade-off is a safer system re: total loss. Had this been exploited, it could have easily been a hundreds of millions of dollars loss.
That's after the bug is fixed, so no need to make up a story; if they were being honest they'd admit they screwed up and actually lost it, which the blog post glosses over.
For instance the "deterministic" build broke ~1mth after.
By itself of that's pretty harmless and easily forgiven, but in conjunction with other claims and everything else, more productive to stop dealing with them.