Yaarel
🇮🇱 🇺🇦 He-Mage
I dont think a four-sentence narrative needs to. It would be weird if a four-sentence description of the Human species did.Nothing within the text would indicate that Tiefling are anything but Good, full stop. If Tiefling can be Evil, please outline any Evil, or negative, or even ambiguous text from the description provided.
Those other Humanoid species who "trust" the Tiefling are also "Any" alignment.
Just like there are criminal Humans, there are also criminal Tieflings. This is true of any Humanoid species.
Relatedly, I feel the nomenclature should capitalize the "Any" alignment, in the same way that it capitalizes the other Alignments, like Lawful or Chaotic. At this point, "Any" functions as a technical descriptor of the alignment tendency of a species.
So 5e has eleven alignments, the traditional nine including True Neutral, plus Unaligned, plus Any.
An individual cannot be Any alignment, but the groups that the individual is a member of can be Any alignment.