De-icing fluid on the aircraft is a contaminant which can change the aircraft takeoff performance. Test flights many years ago (early 737 ?) indicated that the loss of performance was not significant with respect to the margins in the performance calculations.
A few years ago with the introduction of ‘thicker’ type 4 fluids, created unforeseen problems with ‘gelling’ or dry out because the wing voids retained residual fluid. As part of these investigations, test flights indicated that the performance loss of some aircraft would be higher than previously assumed due to the fluid remaining on the wing much longer. Thus additional procedures were required.
Also, for some aircraft types flight handling characteristics changed, which required special procedures, configuration, or performance.
#1 does not give the aircraft type, thus the use of TOGA could be type specific, either for performance reasons or flight handling.
From memory turboprops had more restrictions than jets.
This question might also be connected with no flex power on contaminated runways.