@GLR340's link states 4K in the cover image so they must've upscaled the video and possibly the images too, which must be behind the whole re-release thing.
Another thing I've never understood about FTV is that they seem to have releases in "collections". e.g. you can see from her cover that it consists of "Fit, Sexy Brunette", "Resort Modellling" .. and so on. Normally you'd just have individual scenes consisting of a photo gallery and a video whereas these ones seem to come as a package as it were... consisting of various different shoots in different locations. Having never been a subscriber, I've never got to the bottom of it.