Is the message misleading? Yes, it is. Is the message being misleading, relevant, important, game breaking? Not at all.

Also, there is a difference between "The active duration of companions summoned with Gysahl Greens has been increased from 30 to 60 minutes" and "you can extend the duration of your companion by using an additional gyshal green to a maximum of 60 minutes".

Some people need to improve their reading comprehension skills for sure.