I have no idea how to fix the lights flickering. It was the same on the scene, but i set lumen quality higher and it helped. But still i have the massive flickering in the mirror reflections, tried to fix this by adding planar reflections and change global reflections method to screen space, nothing worked. Also mirror is just simple material with 3 parameters.
this is the material
and this is postFX settings
i dont know how to attach video, but this spost (especially on the wall and dark surfaces) are flickering very hard