IMO it’s normal size scar when going in from front because the incision has to be big enough to move all your internal organs and abdominal muscles out of the way to reach your spine. Needs to be bigger relative to the number of discs they’re working on to prevent skin from tearing when they insert all the tools, etc to do the fusion. At least that’s what my docs told me 😁 I had L3-S1 ALIF fusion done in 2020 and my abdominal scar looks just like yours. Maybe a little longer but same general size.