As it clearly states, all of that only applies to proc-based runeforges. The runeforge you talk about provides a completely passive bonus, and so works without any problems when applied to both the weapons you're wielding at the same time. It is also why the post you quoted further mentions details for the three proc-based runeforges.
Originally Posted by Larisroth
Runeforges with a PPM appear to have the same PPM when used in the offhand. Using the same Runeforge on both weapons while dual weilding still only applies a single buff.
Cinderglacier is a 1.5 PPM enchant. It puts up 30 second buff with the same name and 2 charges. Blood Boil, Icy Touch, Death Coil and any Scourge Strike will consume a charge of the buff. Death and Decay, diseases and appropriate weapon procs will be buffed by the damage but not consume a charge. Icy Touch using the last charge will still buff the ensuing frost fever.
Razorice is either a high PPM enchant or has a flat rate. In 3.3.3 it will be applied by every attack. It has 2 effects, one called Razor Frost that does 2% of your mainhand weapon damage as frost damage (around 10 damage), the other provides a stacking buff called Frost Vulnerability that buffs your frost damage by up to 10% for 20 seconds. In 3.3.3 it will stack 5 times at 2% which currently it's 10 times at 1%.
Fallen Crusader is a 2.0 PPM enchant. The buff is called Unholy Strength buffs your strength by 15% and lasts 15 seconds.
I'm sorry, but I don't think I understand this. Are you saying that using the same Runeforge to inscribe one's 1h weapons only applies one of the ppm? Did you mean the same rune inscription? That would make more sense.
If I understand this correctly, in the second paragraph you state that using two 1h weapons with Cinderglacier would cause both to proc if only one procs (1 buff with 2 charges), since you state you get both buffs at once, which is different than what you are trying to convey in the first sentence.
If possible, could you clear this up for me a bit, and for other who may also have an issue with this.