I might be alone in this, so I understand if this is the lowest priority, but would it be possible to remove games that have at some point been free as "Historically Low" and perhaps add that information as a note on the game instead? Or, failing that, to allow to filter "Historically Low" only within the parameters set (in this case, if the max discount is lowered from 100% to 99%)?
As I've said, I understand this is a very niche request, but I feel that, as is, it might eschew the results, especially with sites such as the Epic Store releasing games for free and thus hiding prices that are potential historical lows.