I'm not sure I'd take him as some neutral authority on the history of cars and driving in Europe.
According to their videos, they prefer trams within cities; generally take trains between cities; and acknowledge that cars are very useful for places which aren't so well connected (e.g. places that are far apart which aren't on a train line). They think encouraging the use of cars within cities is a bad idea (dangerous, scales poorly, makes those areas less pleasant to be, etc.).
Not what I'd think of as a "biking maximalist".
They do show themselves cycling to places that are nearby. Does that make Youtubers who record videos in their car "driving maximalists"?
Not US expat either (or not yet), Canadian.
You should really ponder the sanity of asking if a channel called “not just bikes” is a bike maximalist.