The second possibility is that the job you are applying for requires proficiency in English, and English may be used in your work.
Another possibility is to simply narrow the screening scope. For example, some good enterprises have too many applicants and really have no energy to choose. At this time, the unit will raise the threshold, such as using English level as an indicator to eliminate candidates, thus narrowing the screening scope. For example, some relatively good banks take CET-6 as the threshold when recruiting, even if they don't need it at work, they must meet this requirement.