It is actually pretty high for an individual earner. According to this (https://dqydj.com/income-percentile-calculator/) which is sourced from the Census Bureau, it's at approximately the top 25% of earners in the US.
this article is about seattle though. sure there are a lot of places in the US where 50k goes far enough, but I don't think it does there.
also, what is the upwards mobility like in these types of jobs? anecdotally, it seems like managers on construction sites went to college. I imagine it tops out, kind of like software development, until you reach a managerial or director level.
It is skewed by part-time workers, I suppose, although I don't see why they should be excluded, but it explicitly states that it does not take into account non-workers.