When cat urine seeps into wood flooring it causes the fibrous cells in wood to swell and warp ruining the flooring planks. The only way to fix this is by replacing the wood. Depending on the extent of damage from cat urination this can mean replacing only a section or the whole floor. This can be an expensive project!

If you can't afford to replace the wood flooring right away, you can treat the wood with the recipe but remember wood is preamable and it could make the wood swell further, causing further damage. You will have to decide whether you can live with the odor or not, before replacing the flooring.