Yeah, he dwarfs Arnold in that pic. They were both "offseason". Offseason for Bertil is a Dennis James marshmallow man offseason, while it is skinny for Arnold (he was just getting into the movies). No matter what the reason, he still looks twice as wide as Arnie.
As for the Bertil 2 DVD, I haven't seen it yet, but I did hear that it was from around 1991. That would put Bertil at 40 years of age. It will be cool to see how strong he is at that point in his life.
I did hear he was down to 160 now in jail.