It is, you are confusing two things. You can ask to temporarily suspend paying back your loan. That extends the period. However, this is not the same as the zero euros per month if you have minimal income and are part of the old system.
Ah, thanks for clearing that up. I think I'm part of the new, or at least newer system. I also vaguely recall they upped the 15 years to 25, but for me it's not a big issue as right now I can pay my monthly calculated amount without issues.