Everything I have read has stated that Meltdown is thought to only impact Intel chips as it is the only platform they've been able to observe the possible exploit on so far. That doesn't automatically give other processors a clean bill of health. All these processors do speculative processing, and Apple very well could have R&Ded (ripped of and duplicated) Intel's implementation for their custom A-series chips. Or there could be another avenue not yet discovered that is vulnerable to a similar attack.
Apple licenses ARM architectures. They didn't reinvent the wheel. Given ARM was affected, it was almost guaranteed Apple would be affected. We now know with 100% certainty Apple is affected.
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Do they conform to the x86-64 spec? If they don't, they aren't impacted.
BL.
You obviously don't know what you're talking about.
Any processor that uses out-of-order with a high degree of speculation may be affected.
Apple has just confirmed their processors are affected.
https://support.apple.com/en-us/HT208394