Abandonment of Maria Clara doctrine may be VOID due to Constitution's Article 8.4.3?

IBP Quezon City 2017-2019 wrote on Facebook: "The Supreme Court has abandoned the decades-old "Woman's Honor" doctrine in rape cases (i.e. that no young Filipina of decent repute would publicly admit that she has been sexually abused, unless that is the truth, for it is her natural instinct to protect her honor) in the recent case of People v. Amarela, G.R. Nos. 225642-43, 17 January 2018." CLICK HERE FOR THE FULL TEXT OF THE CASE.

1960 MARIA CLARA/WOMEN'S HONOR DOCTRINE: It is a well-known fact that women, especially Filipinos, would not admit that they have been abused unless that abuse had actually happened. This is due to their natural instinct to protect their honor. We cannot believe that the offended party would have positively stated that intercourse took place unless it did actually take place.
PEOPLE V. AMARELA: This opinion borders on the fallacy of non sequitor. And while the factual setting back then would have been appropriate to say it is natural for a woman to be reluctant in disclosing a sexual assault; today, we simply cannot be stuck to the Maria Clara stereotype of a demure and reserved Filipino woman. We, should stay away from such mindset and accept the realities of a woman's dynamic role in society today; she who has over the years transformed into a strong and confidently intelligent and beautiful person, willing to fight for her rights.

WHY VOID: It, however, must be recalled that the case was decided by the Supreme Court's Third Division under the ponencia of Justice Martires. Under Article 8.4.3 of the 1987 Constitution, "Cases or matters heard by a division shall be decided or resolved with the concurrence of a majority of the Members who actually took part in the deliberations on the issues in the case and voted thereon, and in no case, without the concurrence of at least three of such Members. When the required number is not obtained, the case shall be decided en banc: Provided, that no doctrine or principle of law laid down by the court in a decision rendered en banc or in division may be modified or reversed except by the court sitting en banc."