This set of models are described in the paper "On the origin of IR emission lines in star forming galaxies", 2023, by Martinez-Paredes et al.
It contains 2,358,330 entries, corresponding to the following variations of parameters (the exact number of combination would be 2,358,720 but some 390 models did not run).
The ionizing SED is taken from Charlot & Bruzual 2019, as described in more detailles in Martinez-Paredes+23.