According to Section 860 in Chuseiron, even if such people die in right mindfulness chanting the name of the Buddha, there is no doubt that they will go to the Avici hell because of their great sin of slandering the Hokke sect.
「中正論八六十に云く、縦ひ正念称名にして死すとも法華謗法の大罪在る故に阿鼻獄に入る事疑ひ無しと云云。」