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I'm going to trust the recommendations of a professional association with dozens of named authors written after an extensive public notice-and-comment period, rather than what seems like a bespoke equation from some pseudonymous blogger with no expertise in the field, cobbled together in 15 minutes with coefficients that appears to just be the first figures found on Google.

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TBH, the research into the effects of CO2 on cognition are limited. If your goal is to err on the side of safety, you ought to consider that a regulatory body tends to only consider data that exists. Given that little data exists for this, they likely did not consider cognition in their recommendations.

Additionally, this is pre-covid. It's very clear now that most buildings do not cycle air enough to mitigate transmission of disease. This was less of a consideration when these recommendations were made.

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