You still don’t get it. And calling yourself out as literate, or really anything that benefits you, does not help your argument.
It improves enchantments by 20%. Not all enchantments work the same way. Things like Hydra and Chain Lightning work based on mana spent, which means they will cast after a certain amount of time. The node makes them happen 20% more often. This is correct because it’s making the enchant stronger, not the spell it casts.
For an enchant like firewall, where it’s a 25% on lucky hit, it becomes 30%. Again, a 20% increase.
The description is correct. It’s only when people try to read too much into it, and start thinking it means more than it actually says, like the OP did, that people get confused. That or they don’t understand the basic math behind it all.