[carl_dr]

They don’t take it at normal dosages.

A test showed that they couldn’t get 12 trained cyclists to have a level above 510ng/ml in their urine, when they took salbutamol at the maximum WADA level of 600ug in an 8 hour period. [1]

The WADA threshold for salbutamol is 1,000ng/ml [2] So this level is about twice the level performance tested in your first link above.

Athletes can get TUEs for levels higher than the 1,000ng/ml limit or to take it using other methods than inhaling. [2]

Cyclists have been banned for having levels at 1,900ng/ml and 1,320ng/ml, and they were banned because the sport considers it a performance enhancing drug.

I imagine (but have no evidence, since they aren't published) that cyclists with a TUE regularly race with levels similar or above that. And without spending hours researching, I imagine this translates to other sports similarly.

[1] https://respiratory-research.biomedcentral.com/articles/10.1...

[2] https://ita.sport/uci-therapeutic-use-exemptions/