My experience is consistent with this. Not only does it speed up any motion tied to blueprints but it creates ghosting artefacts due to actors moving in the ticks between frames. TAA can cause blurriness and ghosting normally but in this case it happens to every thing that moves with a blueprint as the movement is occurring on each sample rather than each frame.
I’m using niagra for schools of fish and other fish running ai blueprints, but i have other keyframed animation in the sequencer and am using movie render queue