Was having a friendly debate about this topic and wanted your input. I don’t have the tablet anymore so I can’t test but my reasoning was:
I was almost certain this was not the case and I didn’t bother to prove it before I died with it. I tried using tablet against ava (uncentered enemy) and didn’t “feel” like all shots were hitting. Also logically it wouldn’t make sense that all shots can hit an uncentered enemy since all the shots essentially follow the same trajectory as a normal spell (the boomerang action simply retraces the same path as a tiered spell, unlike the parametric patterning of para spell which allows full spellbombs on uncentered enemies).
My friend claimed he was able to see and hear a delay in the shots impacting target from the spell so idk.
For anyone confused, essentially when you press space bar spells will shoot outwards from the center of a tile. This means it’s impossible to have all the shots hit an enemy that isn’t perfectly centered on a tile, with the most infamous examples being skull, ava and certain chests (you can have your cursor perfectly over the enemy and still see shots miss from your spell).