These pages say yes:
nanoreview.net
But I have no idea if these pages are accurate.
Has anybody heard anything solid? It would be great to learn that the A16 uses ARMv9, as this would seem to indicate the instruction set is coming to M3, eventually (2023?)
Apple A16 Bionic: specs and benchmarks
Apple A16 Bionic: performance tests in benchmarks (AnTuTu 10, GeekBench 6). Battery life and full specifications.

But I have no idea if these pages are accurate.
Has anybody heard anything solid? It would be great to learn that the A16 uses ARMv9, as this would seem to indicate the instruction set is coming to M3, eventually (2023?)