That can't be the correct interpretation.
Light was nerfed by Shinsu, and this tower is full of Shinsu. Only Urek's Light was affected, the others weren't, his physical strength has not diminished.
There are three axis powers involved in this matter: Light, Darkness, and Shinsu.
If Phanta is unaffected like Urek, it means Light < Shinsu < Darkness.
And Urek currently has Light + Shinsu.
So he should also be nerfed by Phanta, since Phanta is also an Axis.
??
One possibility is that Urek is similar to Baam, someone born to become a new Axis. However, they don't become Axis immediately upon birth. They need time to become Axis, and when he was about to become an Axis, his power was stolen. This means he hasn't truly become an Axis yet.
Another...
If Urek's power was nerfed, then Phanta should be in a similar situation.
Besides, Urek is recovering his light powers that he lost in the past. This means he may have once possessed Axis power, lost it, and is now restoring it.
Axis should be considered a type of power iirc, but now we're...
First, we know Phanta was known as an Axis from the beginning.
Second, Phanta didn't wander around the tower looking for an exit like Urek did.
Finally, Urek said he lost his light when he was at his brightest.
And Urek was literally injured by the 2F regular princess. This leads to the...