My read here is that separation distances really play into this.
This is reflected by this section of the report:
The proposed setbacks for the 11-storey building are 7.5 metres from the northand east property lines. The proposed 11-storey building is set back 10 metres at grade from the existing 16-storey residential building, where the principal windows for existing tenants are located.As the 11-storey building increases in height, separation distances to the existing 16-storey building increase, but they do not increase sufficiently enough to meet the intent of the tall buildings policies of the Official Plan. The proposed setbacks of the 11-storey building are not adequate and do not ensure a compatible development between tall buildings. Given the siting of the 11-storey building and its location interior to the lot and adjacent to other development sites, an improved building siting and relationship between the buildings is required, including a greater separation distance to adjacent property lines. The 11-storey building does not frame the site in good proportion, and the building massing as it relates to the relationship and compatibility with existing buildings, proposed landscaped areas, and surrounding existing developments is not supportable.