Why is it considered that Echidna is a space-exclusive denizen when on page 4777 Aranea says that she spoke with her?

The Echidna Situation is weird with Aranea because there’s the implication that she may have been her Denizen- But it’s never outright stated. She says about “Speaking” with Echidna, but never about ‘My Denizen’, and it thematically fits for her to be the Space Denizen. On top of that, Aranea’s way of telling stories can be misleading. She could’ve had the idea to consult with Echidna, and have gone ask her like Kanaya and Karkat went to see her, but explains it kinda putting herself in the spotlight.