Reefbreeders got back to me. I'll just paste the reply below. The flickering is an inconvenience but not a huge deal. I guess if I was a video content creator it could be a bigger concern.
Your newer Meridian 45 uses a different driver timing profile than the older Meridian 11, and certain camera sensors can detect that timing throughout the schedule even though the light appears steady to the eye. We have already identified a refinement that should significantly improve camera compatibility, and it is being prepared for implementation in an upcoming update. In the meantime, there are camera settings that can reduce the effect, but this is not something you should need to permanently work around.