Hypo, in our musical context, means, lower or lower eschelon or beneath, even secondary. In terms of useage, both the mode and hypo mode are the same. The difference between a mode and a hypo mode is resolution. In early times, before me, modes were primarily vocal. Through time and extensive rewrite, the idea is applied to harmony.
Example E phrygian--resolution is E/C. Hypo is E/A. In a modern sense, hypo is not useless, but my view, pretty trivial. One needn't learn or take the time to learn in a traditional sense, only to find out, "Hey, I already know this stuff!" Even notice, said this indirectly, "chords or notes, don't have to resolve a certain way..." Paraphrased, mind you.

I'm still from earth. I wish to be heard, then played, tried out, whatever the new terms. Music theory and music fact, are two different puppies. My application of theory or fact, is much looser with this site, because it's entitled "Guitar Tricks." No malicious intent is intended.
A lot of time and angst could be saved and remedied through simply reading what is written. If one doesn't understand, ask. Saves time and space. Most excellent guitar schools teach chord/scale relationships. Fortunately, it's the way I teach. It's simpler and faster. I've been doing this for a long, long time. I still have my hair and my teeth, though.