How come the charts that show the mass distribution of the universe don't include energy at all? This one [0] says that "visible matter" is 5%, but "energy" isn

How come the charts that show the mass distribution of the universe don't include energy at all? This one [0] says that "visible matter" is 5%, but "energy" isn't even present. From my light research the only answer I found was "because it's too small to include", but this seems to disagree with your comment. What am I missing? [0] https://svs.gsfc.nasa.gov/12307 https://svs.gsfc.nasa.gov/12307