I think, it does make sense, since a spectrum, which exactly matches a black body radiation is considered as 100 CRI.
(For now, let’s assume, that a given spectrum is perfect for a given color temperature - we don’t want to mess with correlated color temperature /which is calculated for suboptimal light sources with uneven spectrum/)
Once the tint goes above or below black body line, it is not an accurate black body radiation anymore - so it cannot be 100 CRI in any circumstances.
The reason why many people tends to prefer ‘under BBL’ tints, that it gives more saturation to the scene.
Please correct me, if I know/remember it wrong, but the latest LED tests now work with two summarizing value instead of single CRI (Ra).
The first one is R-fidelity (Rf) - which would mean the accuracy of the color rendering - which can be max. 100.
The second one is R-gamut (Rg), which actually can be more than 100.
If above 100, we speak of adding saturation to the scene (this is when ‘under BBL’ tints), as we get more light for the parts of the spectrum, where human eye is less sensitive, thus color perception gets boosted somewhat (as a ‘side effect’, tint becomes rosy) - this effect can be regarded as pleasant and can be felt as a ‘superior’ light source - making the CRI/Rf drop seem to be of no sense, despite the measurements.
If under 100, we speak of desaturating the scene (when using ‘above BBL’ tints), where we tend to miss blue and red colors from the scene, and we talk about a tint being ‘greenish’ in most of the cases - these tints sometimes can be felt less useful/’inferior’ even with relatively high CRI/Rf readings.
Look at any measurement, which is recently provided by maukka. You can see a graph on the right with Rf and Rg coordinates. You can see a triangular area, which has white background (or another with lighter gray) - this shows, that how much under/oversaturation (difference to 100 on the Rg axis) is possible for a given value on the Rf axis - of course, less under/oversaturation is tolerated, if one would go for a higher Rf value.
Now I hope, this makes sense to you
This is why I love that red dot in that graph (and the 99 color samples as well, but for a different reason).