Except that one chart there... BEFORE you get Last Whisper, and with about 50 AD (which is where you tend to start as an ADC).
I'm not saying it's a huge improvement, but it still holds that AD runes are better early, and APen runes are better later. APen runes will out-scale your AD runes relatively early, but as can be seen from double-dorans stacking and the like, players want that early-game edge.
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Keep in mind that the chart is only a comparison between
Full AD and Full AR
I have been trying like hell to find the chart for the combination of the two that is alot easier to read to no avail, and as time consuming as it may be you can test this very simply yourself in a custom game on some minions.