Is this true about package project panel?

Hi,
I’ve just read this from tutorial forum.

File Panel -> Package Project

  • most intuitive way because it is right in front of your nose
  • needs to be set up in separate Panel (Edit->Project Settings->Packaging)
  • does not allow creation of patches or downloadable content (DLC) after shipping. (most severe con)

Is this underlined statement true? Does it mean if I make a package using Package Project, I can’t not create patches or dlc on that package?