Allophonic splitting is a well-documented linguistic process whereby predictable contextual variants (allophones) diverge to create new, distinct phonemic contrasts.
The retrieved papers include studies detailing allophonic raising splits and transphonologization (e.g., papers 7 and 11), which provide direct support for the claim that allophones evolve into distinct phonemes through phonological splitting. None of the papers refute this foundational concept in historical phonology.