It seems LG 16 speaks more to the unchurched than to the Protestants that the replies take up.
(Lumen Gentium),” “Those who, through no fault of their own, do not know the Gospel of Christ or His Church, but who nevertheless seek God with a sincere heart, and, moved by grace, try in their actions to do His will as they know it through the dictates of their conscience – those too may achieve eternal salvation” (no. 16).
What about LG 14:
Whosoever, therefore, knowing that the Catholic Church was made necessary by Christ, would refuse to enter or to remain in it, could not be saved.
This does not seem to get the broad reading of “Catholic Church” Fama implies when it follows:
They are fully incorporated in the society of the Church who, possessing the Spirit of Christ accept her entire system and all the means of salvation given to her, and are united with her as part of her visible bodily structure and through her with Christ, who rules her through the Supreme Pontiff and the bishops.
As is normal on these pages, it is not invincible ignorance, nor the un-evangelized, but fellow Christians that get poked in the eye.
When reading Catholic teachings. The basics must be understood >first.
God decides >fault. God decides who gets into Heaven.
Sin is what keeps people out of Heaven. God gives All people free-will & sufficient Grace to get into Heaven.
Sin requires 1. Willfulness, 2. Full Knowledge & 3. Serious matter (for mortal sins).
On Judgment Day, we will not argue with Jesus Christ like lawyers. The question & answer for the final exam is in the Bible:
Q. ‘Do you love me?’
A. ‘Yes Lord, you know I do!’
It’s not possible to deceive God.