Not a typo - the modules directory is named as it'd be after "make modules_install", but for consistency's sake, named the zImage differently
One thing to note is that I noticed that the kernel would boot... irregularly on my device. Probably 1/6 tries instead of the 6/6 tries with the previous .59 release. For now, I'd advise everyone to use the .59 binaries until the issue is resolved. .60 and .61 are large squashed backports, something might have broke in between.