At this point the source illustrates the Hanafi legal preference: qurʾ is taken to mean menstruation through a preponderant juristic opinion. Other jurists have preferred purity. The difference concerns which established lexical sense is intended in the relevant ruling.
A Hanafi preference for menstruation does not erase the other dictionary sense. It means that menstruation is treated as the stronger interpretation in that legal analysis. Detailed proofs are a separate jurisprudential inquiry; the present lesson concerns how a mushtarak becomes muʾawwal.