Heck even further back than that Bloomberg stated there were 3 Mac chips in development based on the A14, with a 12 core version to ship before the end of 2021.
Well, that's exactly where we are. A 12 core Mac chip based on the A14 is in production for Macs right now.
Just for clarity, Bloomberg were referring to the M1 having 12 total cores:
According to Bloomberg, the first of these processors will include a 12-core CPU with eight high-performance “Firestorm” cores and at least four energy-efficient “Icestorm” cores.
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Apple will reportedly use 12-core 5nm ARM processor in a 2021 Mac
A song of Icestorm and Firestorm.
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