Are they in a sense still alive in there?
Shouldn't they be? Orochimaru was still alive inside of Sasuke.
They are just so weak that they will never escape.
However, being revived from a fragment of chakra like he was and taking the bod of a Zetsu may have ended the need for all that.
Like, didn't all the old hosts get sealed along with Orocimaru's main body? How can they simultaneously be in the original Orochimaru body, but also in the chakra fragment's not-yet-formed mind?
I'm sure none of this matters.