It has never been described to be physical. It's being argued in this thread that it is, though, because it was described to have mass close to zero. Which a) contradicts the rest of the series, and b) a nonphysical particles being described to have some sort of mass isn't really an unthinkable concept in fiction.
Yeah, that's what has been happening here. Those other verses, much like this one, had their spirits and souls described as nonphysical (or some other, similar portrayals and descriptions), hence satisfying the definition of the Regen page. Those verses, much like this one, is still described/portrayed to have physical properties (in fact more-so than TSSDK). So that must mean that all of those verses would have their godly regen nulled.
Is it really crazy for something to be described as nonphysical and still have "mass" of some sort? Like you said, this is fiction. Even disregarding how the statement is the outlier among the rest of consistent nonphysical descriptions and portrayals in-universe.
Insisting otherwise is just insisting to strictly apply real world mechanics on fiction, which isn't necessarily an incorrect thing to do, but it is in this case because of how it's contradicted by the narrative of the story. And why not just stop at mass? Anything affected by gravity is physical. Heat is a physical property. Energy is a physical property, as well as force.
Because what's happening here is that: the entire setting has clearly described its nonphysical aspects, which includes souls. Yet one statement about information particles having mass, and we invalidate everything else (despite a. nonphysical particles being described to have some sort of mass isn't really an unthinkable concept in fiction, and b. it's an inconsistency at most).