As others have pointed out, Francis could simply be referring here to what theologians call “universal (or unlimited) atonement.” That’s the view that Jesus died for everyone, rather than a limited sub-set of people (as taught by some Calvinists and others). By itself, universal atonement doesn’t necessarily imply universal salvation. It could be, as most believers in universal atonement have taught, that Christ’s passion makes salvation universally available, but that we have to do something to appropriate it, as it were.

Still, though this is a sermon and not a theological treatise, the pope’s language here sounds awfully categorical. And his two predecessors were both fans of Hans Urs Von Balthasar, who argued that we should at least hope that everyone will be saved.