I'm looking to buy the Adobe After Effects CS6 license and I found it for 999$ here:
Do you think is for one year only?
You can get the entire set of Adobe software through the Creative Cloud with all versions from CS6 onward (CS6, CC, CC 2014, and CC 2015) for way less than that!
So, for $50 a month ($600 a year), you get After Effects, Premiere Pro, Photoshop, Lightroom, Illustrator, Dreamweaver, InDesign, Muse, and all the other CC software PLUS the really useful mobile apps!
But, to answer your question no; that looks like a perpetual license. Keep in mind that CS6 is not supported on Windows 10 and is several versions old. So, if you do buy it, you're paying a lot of money for software that is rather outdated.
CS6 may be getting a bit old, but it does have one thing going for it that the more recent versions can't seem to get right -- it works reliably.