in short, hexenzirkle is able to create a space filled with
starry skies, this space has been described as a real space as wolfy explains
(here), or traveler
(here).
because elemental energy is ues, as shown in the OP and the draft that Garrixian made, based on the calculations
here, hexenzirkle will get at least 4A level.
Apart from Hexenzirkle, the one who gets scaling is the High God Tier in Genshin Impact. Because elemental power is ues and the hexenzirkle wizard once
challenged barbatos to a fight, Diluk also once
explained that Alice was the only person besides Barbatos who could rule
Golden Apple Island. From this we can conclude that Barbatos has power that is at least equivalent to a Hexenzirkle wizard or vice versa.