After a short, casual search I've found surprising little on fosin out there. I did find what I think might be the vid you're talking about. If it's the same one I started to watch, the dude took too long to get to any kind of point so I stopped and started reading their web site page on it instead. From what I was reading, he's making bubble hash using fresh frozen and then pressing that.
Since I don't have the setup to do the bubble hash, and since it never hurts to try new stuff, in the spirt of [HASHTAG]#dabchurch[/HASHTAG] I'm going to do I think my own frosin run, but skipping the bubble hash part just to try it out. Will be pulling both the Berry Bomb plants this evening after the lights are back on, and think I'm going to take one decent(ish) branch off each plant, trim the bulk of the stem off and just toss the rest in some baggies and into the freezer until tomorrow night. Then shoot for a press around the 225F temp range on the 6 ton and just see what I get. *insert evil scientist grin here*
Will take some pics and report on how it goes. Should be fun!