No, that addresses reproducibility, which is worthwhile but is not the same as predictability.
Predictability in this context means simplifying the problem. If uninitialized memory is nulled, then I know what I'm looking for/at more quickly. Likewise if it's set to any other particular, known value. I know it will (or won't) be failing null checks, and I know that it will (or won't) be segfaulting if dereferenced. This helps with characterizing and fixing bugs, (related to but distinct from detecting bugs in the first place). Relying on this to make the program work is bad, but that's not the same thing.
Predictability in this context means simplifying the problem. If uninitialized memory is nulled, then I know what I'm looking for/at more quickly. Likewise if it's set to any other particular, known value. I know it will (or won't) be failing null checks, and I know that it will (or won't) be segfaulting if dereferenced. This helps with characterizing and fixing bugs, (related to but distinct from detecting bugs in the first place). Relying on this to make the program work is bad, but that's not the same thing.