This may be Apple's first real response to the checkm8 vulnerability. It had already been fixed on the current iOS devices as of its disclosure, but the T2 chip

This may be Apple's first real response to the checkm8 vulnerability. It had already been fixed on the current iOS devices as of its disclosure, but the T2 chip is still shipping (and is currently on computers that will last for a decade versus phones that last two years) with no fix AFAIK. Apple could fix T2s going forward, but it would require a BootROM change not just a software update.