I agree with this.
The base resist rate seems about typical, its the duration which seems not correct:
https://www.youtube.com/watch?v=X4SQtViIp00
https://www.youtube.com/watch?v=9opZFThy95w
https://www.youtube.com/watch?v=LlzAutiwi_A
https://www.youtube.com/watch?v=8YBEqvc01ZE
When watching each of these videos you will see that about 50% of the raid eats a fear each time it casts. Of those 50%, the vast majority are un-feared after 6 seconds and everyone is un-feared after 10 seconds.
No one is getting 15-20 second fears, let alone seeing 10-20 raiders having such long duration fears.