Well, turns out JLCPCB probably made that EasyCAD drawing. There's no pinout in the datasheet. So they most likely just looked at how the LED is packaged on the reels and made an arbitrary decision as to which pin is what.

If you want to follow some drama on LED pinouts, you can read my thread over here (this is the other place I go to get balanced information on general electronics material):

https://forum.allaboutcircuits.com/t...an-led.201924/