I did expect that to be the case, I was surprised because they still seem to be higher than other ones despite the fact that the trinket is working on passive stats alone and wasn't sure if the sim used had been set up properly.
I am questioning how well the data in the first post was set up, not how well simcraft was made.
The sim lists Frost Bomb with Light of the Cosmos better than Nether Tempest with Light of the Cosmos, which really surprises me for reasons already explained.
If that's really true it suggests that there are some real problems with how that spell works!