If the latter, then the burden of proof is upon you to evidence this, seeing as it is simply incongruous that the Holy Spirit would not state that Mary was one of the only persons besides Christ that was sinless, or record perpetual Marian virginity (PMV), seeing that He characteristically records notable exceptions to the norm by even great to lesser characters, from extreme age (Methuselah), to excess size, fingers (Goliath), strength (Samson), barrenness (Hannah), a celibate marriage (David and Abishag), prolonged celibacy (Anna), ascetic diet (John the Baptist), the supernatural transport of Phillip, the singleness of Paul and Barnabas, and uncharacteristic duplicity of Peter, and the surpassing labor and suffering of Paul, birth by a virgin (Mary), to Christ being sinless, which is mentioned at least thrice.
Sorry. I’m not a believer in sola scriptura.