Well yeah, it's pretty similar, but at the same time anyone who knows warcraft knows that it's been the same story for 20 years, before the migrant crisis. You have to have either very little or no knowledge of warcraft whatsoever to believe it was some kind of propaganda arguing for migrants.
And anyone who knows the warcraft story would also know that it goes like...
SOME orcs partake of demon taint and become violent.
Destroy their own homeworld unwittingly since that was the intent of the demons all along.
Demons encourage orcs to invade and destroy Azeroth, but don't personally go there to make sure it happens.
Tainted orcs run around Azeroth for a bit and sow some violence and destruction in a relatively small area.
Orcs are defeated and put in internment camps.
Horrible living conditions, torture, starvation, etc. in camps.
Thrall and a bunch of others escape to make their home in Kalimdor.
Yeah... sure... there's a loose connection, but this story has been around way longer. Just imagine if lord of the rings had been released during the time when there was a tyrannical dictator that was taken down and people made a connection to that... and yet it's a story that's been around for a long time.