Another view of this weather system:

Cyclone, because it is in the Pacific rather than the Atlantic. Bomb because it undergoes bombogenosis, which is a rapid and sustained drop in pressure in the center of a low-pressure system. Typically, 24 millibars in 24 hours. This storm is I remember correctly had that occur at 3.6 times that rate. We've had both terms (bomb cyclone and atmospheric river) around forever.

It’s a scientific term… we didn’t make it up. https://en.m.wikipedia.org/wiki/Explosive_cyclogenesis

There are lots of meteorological sites with tons of info on terminology if you feel like doing some self learning instead of trying to get likes via ignorance.