This is pretty meaningless in and of itself, the author hasn't done his homework.
Apple has a long history of doing some basic testing of their OS on different chips, even different architectures. Technically MS did this for a long time too. I would imagine both companies have their OS' running on ARM in a lab somewhere. There are little indicators in the metadata / config files and such for both companies. This allows them to stay 'light on their feet' if the market suddenly shifts or their favored supplier has a failure, like if Intel were to get stuck on the same process node for 6 years...
Intel jabs aside, I've seen a lot of these kinds of articles over the decades and 95% of the time they are meaningless. This is just Apple being prepared to shift direction, not actually doing it.
Most likely Apple is just preparing in case Intel's failures continue into 2021 and leads to a truly large performance and market shift towards AMD. The main message here should be that Apple is not completely confident in Intel's ability to hold market dominance and/or the perception of the performance leader. And yes, outside the techie forums most people still think Intel is the performance leader. It's still pretty close in reality too.