No, I disagree that we should delete that sentence. Masahiro Yamamoto's book was very well received by scholars and I don't know of any other scholar who would seriously dispute that statement. It's not true that it contradicts the IMTFE. The IMTFE used the burial statistics of the Red Swastika Society, which only included 129 women and children out of 40,000 burials. The only other burial statistics that the IMTFE used were those of the Chongshantang, which are now known to have been forged, though even these records confirm what Yamamoto said.