There was some discussion about that earlier here: HDR Slight flickering (Solved for now).
There seem to be some limitations with LG OLED displays, but nothing to suggest the cause of a flickering.
The player will be able to output in the same formats as Vero 4K and vice versa. This is defined by the HDMI standard. It may be possible that some formats produce less visible flickering.
The TV or player may have a settings option to display the output format.