The original test linked at the beginning of the article is telling that multicore is not that relevant for the tested performance. The article is mentioning the power envelope and the fact that 5nm is temporary exclusive to Apple, but not for long - AMD will utilize it and that would be a closed test. In the end, if you want to compare performance before you buy, you care less about the internal and more about performance and price.
The first test listed is Renaissance, which, from https://renaissance.dev/resources/docs/renaissance-suite.pdf, is a concurrency benchmark. It likely benefits from multiple cores. All in all I'm not sure the author has the relevant expertise.
I look forward to an M1 processor comparison to something with a similar core count, similar total power envelopes, and similar cost. The Ryzen processor benchmarked here costs more than the entire Mac Mini M1 system.
They're 2 different CPU with the different market. The only reason I think that this comparison is being made is that it is a response to an avalanche of articles claiming that M1 beats everything speed wise and is the best thing since sliced bread.