The guy is German, and the German language traditionally uses generic masculine pronouns, although that has become a big political issue in the past years. Some new gender-neutral forms have developed, but some of them have even been banned by the “center”-right-wing clowns in two state governments, and it’s all a bit of a mess. The guy probably thoght “they” in English is a similarly experimental concept, and while it’s still dumb and he should just try to be as inclusive as possible, it’s probably not a matter of him purposefully excluding women from the documentation.
We should stop seeing it as an “old people thing” to be critical of a specific technology or innovation. After all, nowadays it’s often the boomers who are the least aware of the negative aspects of things like social media or “the cloud”, simply because they don’t understand it, and just assume it’s how the world works nowadays.