CathInfo.com

By their approval of beliefs that allowed people outside of the Church to be saved, they opened the gates for modern clergymen to fling open the gates to all infidels. Now we're stuck with the V2 Popes saying "It doesn't matter if one is Catholic".

The belief that Jews, Muslims, etc. can be saved is certainly heresy, but the failure of pre-V2 Popes to condemn it while it was running rampant among the clergy, and the support given to it by post-V2 Popes, means that a Catholic who believes it probably thinks that's what the Church teaches. So it probably isn't a formal heresy in most cases.

I didn't say that at all. What I said is that pre-Vat 2 Popes approved beliefs that allowed people outside the Church to be saved(Pope Pius IX taught invincible ignorance and Pope Pius XII believed unbaptised infants are saved), while also failing to condemn the rampant heresy among their clergy that other non-Catholics can be saved. EENS used to be very simple, NO ONE outside the Church can be saved whatsoever. But by those Popes expanding EENS to include people who are outside the Church, they justified modernist heretics to start teaching that others outside the Church could be saved too. And they failed to condemn those beliefs.
Now we're stuck with post Vat 2 Popes who actively support the belief that muslims and jews can be saved, with Francis even saying that "It doesn't matter if one is Catholic."
I would not blame the average Catholic layman for thinking BOD is what the Church teaches. It is the fault of the Church for failing to condemn heresies among its own ranks that led to Vatican 2 in the first place, where they proceeded to embrace all those heresies.