Huh. I feel like the author has their BSDs mixed up! NetBSD's main claim to fame is that it runs on practically everything, even lots of platforms no longer supported by mainstream Linux distributions. The page links to the laptop wiki, which is about AMD64 laptops and their finicky peripherals and driver support. A better place to start for hardware support is https://wiki.netbsd.org/ports/.
That means available number of architectures. NetBSD still support some pretty esoteric stuff, but though I haven't actually counted I would expect Linux to run on a comparable number of architectures.
Now, the kernel will probably boot successfully on a given machine, but whether hardware (i.e. driver) support will be decent enough for everyday use is a completely different matter! For example, NetBSD "works" on this laptop of mine... except for Ethernet card, Wi-Fi card, touchpad, ACPI suspension, external monitors via the docking station, ... :)
I'm trying (for fun) to bridge some of these gaps, but you can see how this isn't appealing to the average user.