The main difference in whether Shiki can see lines or dots on Arc from the OG to the remake is, as far as I remember, in the hotel scene.
OG Shiki simply couldn't see any lines or dots on her at night, but in the remake he can see them, only very faintly.
The discussion isn't about Shiki simply not being able to kill Arc at night, it's about whether anyone would be able to trace the lines at all.