The shadows may it look like there is a bolster. Regardless, the Wustof Ikon is already bolsterless, as are a number of other German & French chef's knives. Gyutos are, of course, bolsterless.
I object to calling this a santoku, as it is not a (modified or not) wharny. It also lacks the virtue of a point, which the design can clearly support without issue.
Personally I'd likely prefer more handle just for balance. I also don't see people put their index finger on the spine except when they want to be exceptionally accurate.