Which device is chiefly exemplified by “not because they are better than others”?

Supplementary Practice 14: Scarcity, Evidential Scope and Rhetorical Precision in Public Communication

• Tadhyīl because the second expression states a general maxim
• Tatmīm because it merely supplies a further description
• Iḥtirās: it blocks a mistaken inference of superiority
• Iʿtirāḍ because a clause is inserted inside the original sentence