The POWER architecture uses speculative pipelines too: https://en.wikichip.org/wiki/ibm/microarchitectures/power9 (see "Speculative" in the info box). I believe researchers only verified Intel/AMD and ARM architectures because they are far more widespread. POWER processors are probably at risk too.
Spectre has nothing to do with 'Management Engines" and the like. It deals
with "speculative execution" (e.g., "branch prediction") that aims at faster
executions: https://en.wikipedia.org/wiki/Speculative_execution
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