Possible Error in Italian Handbook

[Alex Fegatilli]

Hi FreeBSD's Team

I am a Computer Scientist Student, I am reading the FreeBSD Handbook in 
Italian Language

In Chapter 3 "Unix Basic" paragraph 5 "Disk Organization" there are 
there words, I try to translate them in TL;DR :

"The File Systems have a fixed dimension. If you create once file system 
and want to extend any partition, you need to back up your data, format 
and extend the partition"

But in this link https://www.freebsd.org/doc/handbook/disks-growing.html 
you can extend partitions without backup, rebuild file system etc...


This is a mistake or I have not understood?