it's in the wrong spot, but it's fine. For SU 2015 on OSX, you want the build that says:
"Nov 14, 2014 2.00.25244 sketchup_2015_osx 32bit "
even though it's actually 64bit. There was confusion over the changes between the latest service release for SU 2013, 2014, and 2015 on OSX. They all only have one platform that they support, but the 2015 version is 64bit only, whereas the other builds are 32bit only. On the windows side, there is a 32bit and 64bit version for 2015.
We will move it soon, but in the meantime, there's nothing wrong with the build, other than where it's being listed on the website.