Android wasn't the first to multitask
The thing about Android being the first mobile OS to have multitasking, far from it. Symbian, Maemo, MeeGo, all had it, Symbian having it since before 2000. Symbian could launch a hell of a lot of apps and keep them in the background thanks to its low memory usage (up to 40-50 apps on 512MB of RAM on Symbian Belle on the Nokia 808 PureView, while Android has extremely high RAM consumption for apps, and that's memory used by an app, not memory used by the OS to cache apps for faster startup.) And they would be active as well, games would continue to load, file explorers would be doing their work, while on Android you'll see no game loading in the background (though that's a good thing considering how battery hungry Android is). Same with MeeGo, which could handle up to 20 apps in the background at some times in just 1GB of RAM, with two HD games included. So no, Android was not the first, and it also wasn't one to do it very nicely given how fast apps would be killed and how much RAM usage was.
I like Android, but again, that's false information. It should say "first modern OS to have multitasking."