That link doesn't show that Lightroom 4 works with OSX 10.9.3 as Mavericks didn't exist at the time. Lightroom 4 does work with Mavericks but I think the only problem is the sliders DO NOT have colors so it makes it less apparent what the sliders do. See here.
STEVE BERG wrote:
Does MACBOOK PRO OSX 10.9.3 work with Lightroom 4 ?