Yes, the poster was genuine and put out by Promociones Del Pueblo however that is about the end of the legitimacy.
If you look at the Filipino fighters you'll see that they, at least two of them anyway, are more familiar than the names attached to them.
The picture of the first Filipino, supposedly Mark Duran, is actually Donnie Nietes the current WBO Light Flyweight champion. This is probably the most blatant mistake by the promoters as Nietes is known in Mexico having fought 3 times in Mexico as well as fighting Mexican's Moises Fuentes and Sammy Gutierrez in his last 2 bouts.
The man who is supposedly Vergel Nebram (which it's self is a spelling mistake of Vergel Nebran) is also not the man he's supposed to be. Instead of it being Nebran it's actually Milan Melindo, the man who recently challenger Juan Francisco Estrada to the WBO and WBA Flyweight "super" titles and also defeated Mexico's Jose Alfredo Rodriguez in his most recent bout.
Whilst the first two are active world level fighters the third man is probably the most interesting and yet the hardest to really explain.
If you don't recognise him the man, who is supposed to be Adones Aguelo, is actually Reman Salim, a retired Filipino journeyman. Salim, who hasn't fought since 2010, may have fought some recognisable names including Poonsawat Kratingdaenggym, Miguel Roman, Sod Kokietgym, Daud Cino Yordan, Veeraphol Sahaprom and Terdsak Kokietgym but in all honesty few would recognise him. Why they've chosen to use his picture is genuinely a mystery.
The GAB (Games and Amusements Board) are said to be looking in to who is responsible and it seems likely it's an issue from the Philippines and not Mexico though it's still one of the oddest stories we've heard this year.