Grand Theft Auto 64

I'm not a Spanish speaker, so I can't say for sure that the Spanish gaming magazine article talking about it is legit. However, I also have the same doubts that the three screenshots featured in the article are not from the so-called Nintendo 64 port of the first game in the series for these reasons:

*The first screenshot in the article looks obviously in 2D (I have never played any Grand Theft Auto game in my life, so I can't be sure that any game in the series was in 2D except for maybe handheld ports), unlike the Nintendo 64 which had strict 3D graphics that allowed for no 2D animations. 

*The second and third screenshots in the article are almost identical to each other; they're basically zoomed out shots of the city with some hints of 3D graphics.

I also couldn't find any proof that the port was actually shown at E3 1999 or was just abruptly cancelled before being shown at the event, outside of IGN's page on the game (which falls on the latter category). If Rockstar Games' goal was to make everyone forget that this port did ever exist, they did a great job at hiding it because there is little to no information on this game on the internet and no footage of it confirmed to be legit (I don't embrace this conspiracy theory myself, but I'm just stating how impossible it is to find real information on the port).

Oh okay, thanks for filling me in these details.

It makes mention of the "Dolphin". Dolphin was the early development name for the GameCube and the Dolphin used cartridges. So I am wondering if GTA 64 was originally meant for the Nintendo Dolphin before the Nintendo Dolphin became disc-based and before the fallout between Rockstar and Nintendo? The translated article also says "We will go into details about GTA 64 the next month" so is there a chance at it was 50% complete and was planned to debut at E3 1999? I still do not buy that is was ever shown at E3 1999 as many people would have remembered. Maybe the magazine just got its information wrong.  

That could be the case. 

That is a fake trailer. The footage is from a game called Crimelife 3.

Yes, no "real" media has been shown for GTA 64. I do not even think those screeenshots from the magazine are even from the N64 port.