Back in 1987 when George Michael had a big porno-in-a-song hit that I won't bother to name, Casey Kasem refused to name the song at first but apparently did at some point, because it's in iHeart's replays of those countdowns. I can almost hear him cringing through the radio. (And it only got worse from there.)
If Billboard wanted to be honest they would separate the streaming-era chart records from those before. For that matter, they should separate those for the Hot 100 from 1991 forward as well, since they changed their methodology then as well. A weekly chart, and annual/decade charts based on those weekly charts, are really just snapshots in time. They offer little if any insight as to all-time greatness.