In this video at 0.37 seconds you can hear a distinct pop which, to me, sounds like a compressor stall. So yes, the engine appears to have lost thrust and may have been shut down (it is a single engine aircraft).
https://www.youtube.com/watch?v=N5x8GSx6sGg
The flight profile, to me, looks like the pilot wanted altitude to eject, the seats are obviously not "zero-zero" so he had to get it to 1500 feet or more. The wingover at the end of the climb looks like a classic stall. The ejection sequence looks like the decision was made after the plane started down.
“In this video at 0.37 seconds “
Which video?
0.37 seconds?