I don't think Eris is Taox, but Taox may certainly be alive. She used cryogenic hibernation to survive from the Fundament to the Ecumene Empire. She could still be out there.
No, those are Ammonites. They're a cephalopod species with six arms. Think octopus-like
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Taox? And isn't there a cloak that refers to them
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https://www.bungie.net/en/Forum/Post/153754344/0/0
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But the cloak?
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There's a squid cloak. Whether or not it references the Ammonites is not known
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