The IRGC said four IRGC Aerospace personnel were killed in U.S. strikes on “some positions” in Kermanshah on the night of September 1.

The confirmation quoted Shin’s earlier report from Kermanshah Province:

NOW -
Huge explosion in Kermanshah
Eyewitness believes it was an airstrike

Kermanshah Province, #Iran

In a follow-up, Shin assessed that the personnel were part of a missile launch squad, citing the timing of the explosion and a BM launch:

Doubtlessly they were missile launch squad, the blast I reported last night was heard almost at the same time as the BM launch.