This is clarifying in the sense of "what is the internal structure of this organisation, and how did it come to be".
But I don't think it's relevant to most people's arguments/discussions/complaints regarding any of these "orgs". The reason is that there is just one org. Just one board making decisions. Any discussion of 80k is a discussion of EVF. Any complaint about CEA is a complaint about EVF. They're all interchangable in such contexts. "EVF bought Wytham Abbey" is the same thing as "CEA bought Wytham Abbey", because a literal interpretation of the latter is nonsensical, as CEA is not an actual organisation.
There are pros and cons to insisting on the "proper" names for these entities - on the one hand, preventing confusion; on the other hand, preventing the continuity of criticism aimed at them, and risking that new people who join thus have a hard time finding out about existing criticism.

Most of this makes sense thanks.
I don't love the name "Effective Ventures Foundation" though. My initial reaction is that it's not terrible but not great either. It feels more like a business, or even a specific philanthropy. I'm also not sure it describes well what effective altruism is about (as much as you can describe anything in a name).
Maybe it's just me though? I wonder what others' thoughts are behind the name, and how it was chosen?
I would guess this is at least somewhat intentional, my guess is that some of the orgs under EV (most obviously CEA) want to identify with effective altruism, while others think the brand is too costly for them.
My best guess is that the name "Effective Ventures Foundation" would not have been chosen as the new name of CEA if they had not gotten the ev.org domain. Though I think the new name (and the absence of the "A") correspond to a gradual change in EA culture in recent years. One can call it sign neglect.