Guild Wars 2

I am confused, I think I read somewhere where if you claim one guild hall but then later decide to claim the other than you can keep all the upgrades and they transfer to the new one? Is this correct?

https://forum-en.gw2archive.eu/forum/game/hot/Day-Six-Guild-Hall-Statistics/first#post5679436

2) Yes, to capture a different one go purchase the expedition for that hall and complete it. You will retain your old hall until you succeed the new expedition. All of your upgrades will then apply to your new hall and you will loose access to your old hall.

Anyone figured out the maguuma themes thing and the guild anthem? I’m a bit confused there too?