Here some easier, older chart discussing the issues as understood at the time, though you have to check which riders got busted (all of them except Lemond and Indurain, and Lemond at least won the TdF pre-EPO, Indurain being faster than doped Armstrong is pretty suspicious and there was no testing for EPO at that point IIRC), on the other hand there's also the point that the climb may have come at a different point in the race.
Note that Riis's results were before the 50% hematocrit limit (he was nicknamed "Mr 60%'). Hematocrit is a measure of the hemoglobin content, or oxygen carrying capacity, of the blood. So, even though later cyclists were also blood doping or using EPO, they have been limited to a 50% hematocrit, and that may explain why Riis's power output has not been matched.
https://web.archive.org/web/20240105023309/https://nitter.no...
Took me a very very long time to make sense of the chart.
Watts/kg up, minutes over which that power output was sustained to the right.
White points are Vingegaard climbs in the past, yellow points are Vingegaard climbs in 2022, pink points are other cyclists.
The yellow and white curves are just trend lines? They seem to just be distracting.
And Riis's climb of Hautacam in 1996 is "off the charts" by being very high and to the right.