The Science Traceability Matrix of the CDT report (Section 3.2) -- report linked HERE -- contained Q/U map noise levels for the "delensing instrument," which were calculated by Tom Crawford. Some months later Clem and I noticed that the 270 GHz map depth looked too good, which led to a long correspondence with Tom to understand how these numbers were computed and to me attempting to reproduce them. In this process I arrived at different numbers than the ones in the STM table. Finally, Tom reproduced my calculations and agreed that the updated numbers were the correct ones. For posterity, I attach my code and some details of our correspondence.
The code used to produce the new numbers is as follows. (The 1.3 muK-arcmin SPT performance number comes from Tom.)