70/30% of the logs, not of the errors. It's equivalent to what you're thinking of as market share. (I can't really blame you for misunderstanding, though; this article is poorly written.)

The proportion of errors is better explained in another article:

In fact, for one particular type of error (decompression, a commonly performed operation in games), there was a total of 1,584 that occurred in the databases Level1Techs sifted through, and an alarming 1,431 of those happened with a 13900K or 14900K. Yes – that’s 90% of those decompression errors hitting just two specific CPUs.

As for other processors, the third most prevalent was an old Intel Core i7 9750H (Coffee Lake laptop CPU) – which had a grand total of 11 instances. All AMD processors in total had just 4 occurrences of decompression errors in these game databases.

In case you were thinking that AMD chips might be really underrepresented here, hence that very low figure, well, they’re not – 30% of the CPUs in the database were from Team Red.