Earlier quoted context omitted.
... and Goebbels and Stalin were both part of the government . Why is so hard to understand that government limitations on free speech are fundamentally different from private ones? Freedom of the press means being able to print what you want, not being able to compel the printer. Facebook doesn't have to be complicit in publishing speech it finds repugnant, and why should it?
The concept of free speech has nothing to do with governments or private institutions. The legal differences between those entities has nothing to do with the general concept.
You cannot make me say, write, or publish something I don't agree with; freedom of speech is also the freedom to NOT speak. This extends to individuals and platforms both.
In WW2, newspapers were controlled by the invaders; they were told what to publish, even if the people behind it disagreed.