They are saying that boot related packages (kernel, etc.) are being work on more frequently than other booting-required distros.

They might be spending their time on other things or whatever. Just that fedora is focusing that direction, heavily and regularly for quite a while. I'd say especially since 42 not that i have any history beyond 40. I came from a place I despised but couldn't find one that worked as well and stably til i got to trying Fedora. I did, like a decade ago or more, but it wasn't like it is now to me then.