That article is dated from 1998, and its stated on the Gigantosaurus wiki page, that the names are often misspelled and confused between each other, which is evident, as its happening in this topic.
As for Dino Crisis:
The PlayStation game Dino Crisis 2 features a Giganotosaurus. However, the size of the Giganotosaurus in the game was exaggerated and is much larger than in real life. In the game it is portrayed as being over 20 meters long and over 7 meters tall, while in real life it was, at most, 14 meters long and 5.5 meters tall.
The longest spinos were measure to be around 18m, whereas Giganotosaurus is at most 14m.
Its also quite possible that the Gigantosaurus, has been rediscovered under a new name