He also likes to take credit but he was "only" gameplay designer (working on his idea since 1994, when it was Project Troubleshooter). The game was written by some guy who then didn't write anything else.

After the Troubleshooter proposal, Warren later developed the designs for Shooter: Majestic Revelations (later Deux Ex) in 1997. In regards to how Troubleshooter influenced Deus Ex, Spector wrote: "The details of Deus Ex—plot, character lists, game system designs and so on—changed radically in the years following the original Troubleshooter proposal... Conceptually, however, the game still plays much the way I hoped Troubleshooter would play."

And speaking of whom - also Kotaku, back in 2013:

“Nothing is quite right about the world of Deus Ex”, says Pacotti. “Like all fiction, the gameworld is prone to exaggeration – from the luridness of cybernetic implants to the fierceness of laboratory mutants – but when I try to put my finger on something that is dead wrong, I have a hard time.

“One issue that occupies more of my attention these days is the falling economic worth of human beings. Globalisation simply continues industry’s search for cheap resources and cheap labour, as disruptive as it may seem in the West – and might well work its mischief long before the timeframe of Deus Ex. The more apocalyptic change is automation. The middle class is disappearing because mediocre human intellects, which previously could be effective at organising, say, a filing cabinet, simply don’t ‘add value’ where they used to. The conspirators of a re-imagined Deus Ex would need to be more cognisant of this shift, I think.

“The tone of [the game’s] idea – a [domestic] armed uprising in the US – doesn’t feel quite right today, yet all of the same tensions are present. Accusations of a conspiracy between big business and government, anger at the US allowing itself to be led by other countries, severe wealth disparity, armed standoffs between ranchers and the government, secession movements (like the recent one on Colorado)... A slight shift of focus, and the future could still turn out like Deus Ex after all”.

Cut content from the game included "war torn Texas, invaded by Mexico" and the White House infiltration mission.

He's been unplugged from the matrix, and he's saying "PLUG ME BACK IN."

Almost like he's got a (financial) gun to his head