Yes, if you take a closer look at chapter 1 and at chapter 7, you see that his other arm is never shown, I somehow noticed it in ch. 1 but I just thought it was a drawing mistake. Well, now we know his right arm got cut off and I do be hoping for him that it wasn't his dominant hand LMAO :'))
Bruh I didn't even realise the vampire was missing an arm before they showed the panel in which it got cut off omfg-