No, it definitely can’t. For solo leveling, PW:S is absolutely mandatory.
Even if he’s leveling exclusively through healing dungeons, he should still be learning the spell for emergencies and the knockback prevention.
You can get attacked in PvP while leveling. PvP servers exist. It doesn’t matter if you want to break the monotony or not; someone else can easily make that decision for you.
Uh, what? This is entirely inaccurate.