The numbers are pretty much as expected but I think the conclusions are all wrong.
First let's divide the users into "Home" and "Pro/Enterprise" versions of Win 10.
Home users can't prevent updates, only postpone them for a while. Only recently was 1905 pushed out on a broader scale, so it's no wonder if most Home users have that version installed. A few might have opted to install the latest version (1910?) manually but more haven't gotten the automatic 1905 update yet.
Pro/Enterprise users can delay updates further and companies are more likely to wait because they don't want a change to make some key software stop working. Individuals running Pro are on the other hand more likely to install the very latest version ASAP.