Obviously? Morocco is a well-known hub for migrants from all over Africa who try to reach Europe, but these ones are "quite obviously" Moroccan? What makes it this obvious then?
Is obvious because there is no way 48000 people on flip-flops and football t-shirts, without neither documents, nor money, would be allowed to happily step back into Morocco unless they are citizens.
Also because real sub saharan immigrants would fight tooth and nails before to voluntarily returning to Morocco. A place where many report been abused for months and years, and where they are trapped unless they pay the local mafias a small fortune to quit the place.
Flash mob is a perfect way to describe this, but if Morocco government was behind that, it backfired spectacularly with zero real gains to show for the at least 67 Moroccan citizens that died at the sea just to have a laugh at Spain.
Spain is seen as the victim and after past negative experiences has endured this with relative grace and dignity. Haters will hate, trumpers will trump, and nobody cares. Europe can say what they want, but the crisis has mostly solved itself in 24 hours, and the video of the Spanish agents running to comfort a lost little child crying alone, has made the entire country proud of their policemen.
Morocco instead is seen as the invader, has lost international trust and now it needs to bury many of their citizens including children. The families of the children drown probably think now that this has been a really stupid idea.