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It depends upon the processor's internal algorithms and logic that performs speculative execution.

Basically, Intel has used the same logic and algorithms for speculative execution in its processors for many years now. It worked, it was fast, and they didn't see any reason to change it.

AMD processors are not so uniform. Many of them may indeed be immune to this sort of attack.

ARM processors are unlike any x86 processor, and most ARM processor families don't have this flaw. ARM has been forthcoming about which of its processor families are potentially vulnerable, those that do speculative execution in ways similar to Intel's processors.

The spin coming out of Intel could power a small city.

This is a good example of why diversity is important in any market or natural environment.