Not dumb at all and no need to apologise.
The graph shows, in the blue line, the percentage of drivers with gold, silver, bronze and no reward for this TT (in this case 7.2%, 25.8%, 61.5% and 5.5% respectively), as well as the same points for the average of all TTs to date (10.7%, 24.2%, 46.5% and 18.6%), in the red line. It then draws a smoothed line for each set to connect the awards.
So the WR you indicated is not the WR; it is not a time, but that proportion of drivers with gold. Another way to show it would be like this. That might make it more clear that they are four discrete outcomes, but I think the lines make it easier to compare current with past.
View attachment 1320411
Hope that helps.