Edit 2: per user mikeash, it's definitely flyable (i.e. I'm wrong), but it'll still be grounded to aid with testing efforts. Thanks for the kind correction, Mike! https://twitter.com/elonmusk/status/734274360588926976
"Max damage" doesn't imply unflyable. A later tweet clarified that it's capable of flying again. They'd rather keep it for extensive testing, though, as an example of the most extreme conditions. It won't fly again, but not because it's too busted.
I would think if damage was within tolerances (even at the maximum of such), they'd be willing to relaunch. Implications from the tweet and subsequent conversations are that the damage exceeded thresholds to guarantee safe future flight, which is why they'd use it for testing on the ground.
I'd still read his tweet as meaning it's "too busted" to fly, but I suppose it's up to each person's own interpretation. Your point is well received.
Yup, user mikeash linked this soon after and clarified it for me, so I expressed my gratitude for his far more graceful and generally polite correction of the error in my comment. heh
Edited my comment with source tweet from Elon.
https://twitter.com/elonmusk/status/731984739012251648
It's very likely not going to fly again.
Edit 2: per user mikeash, it's definitely flyable (i.e. I'm wrong), but it'll still be grounded to aid with testing efforts. Thanks for the kind correction, Mike! https://twitter.com/elonmusk/status/734274360588926976