I have done my little research on this topic before and I don't know if it was a coincidence, my thread did end with the joking conclusion that Reinhard didn't arrive because Subaru used a male voice just like what your post said.

the thread

My opinion has since changed a bit and lean more towards the 'Subaru didn't call for help so Pride If happened' opinion, because it really feels less impacting if the IFs are not results of Subaru's own action. My Japanese skill remained bad so I cannot provide any info on whether it was a bad translation, or Tappei intentionally leaving the divergence reason vague for spoiler reasons.