Are you sure Apple really wants them fixed ASAP?

Having these outside, ostensibly-unaffiliated teams provide law enforcement with access helps prevent government/legal pressure on Apple to explicitly backdoor their systems.

The ideal bit of kabuki-theater for Apple would be for Apple to always maintain a public stance of total devotion to end-user security... while reliably letting enough subtle, hard-to-find flaws linger so that a few of the most-well-resourced government-friendly agencies can run a business like this. "Everybody" wins!

Indeed, I'd expect it more likely that Cellebrite & their ilk infiltrate Apple with secret agents, or in other ways obtain Apple-proprietary information, to assist their tool-building. Forbes has reported that a competitor to Cellebrite, Grayshift, includes at least one ex-Apple security engineer among its "Principals":

https://www.forbes.com/sites/thomasbrewster/2018/03/05/apple...

I guarantee Apple has access to these as soon as they appear. I also have doubts that their claims are true, since we cannot verify that it in any way.

Apple uses Cellebrite in their stores to help transfer phones and recover them:

https://twitter.com/antisocial_eng/status/108630141615779020...