The verses are definately referring to the azwaaj at-taahiraat, but the ayat at-tat-hir was also referring to the ahl al-kisaa', as the others have said, hence the change in person: innama yureeduLlahu li yudh-hiba 'anKUM ar-rijsi, not 'ankunna, so it included the wives and the ahl al-kisaa'.