The Tupac holgram is state of the art. It ran about $400,000 to pull off. It was done at night under controled conditions. A hologram which can be visible from all angles in bright sunlight would require a bunch of laser tech which doesn't exist yet, plus a reliable power source. Then there would be the years of testing, the remote facility large enough to simulate the scale of lower Manhattan, and the large technical crew required to make this happen.
Trade secrets yes. Game changing scientific/technology developments - no.
The Theory of Evolution, the aeroplane, the combustion engine, the light bulb, AC & DC current generation, the PC, the Atomic Bomb, and even the Stealth Fighter were all things which were being developed independently in labs around the world. Often without the knowledge of each other.
The technology required to pull off the jetliner strikes on 9/11/2001 would have required multiple breakthroughs in technology. We have not seen those breakthroughs occur independently anywhere since 9/11/2001. So it's safe to say it never existed.
It would have been close. It would have been large. It would have required multiple mirror repeaters on roof-tops surrounding the WTC AND the approach to the island (requiring a could of cargo-type ships). In the thousands of pictures taken on 9/11 there is nothing to suggest the presence of a holographic projection system of any kind let alone a system large enough for your theory.
There were no reports of flash-blindness on 9/11 (to my knowledge) which would suggest accidental laser exposure either. Remember there were witnesses in the neighboring buildings and inside each tower. A hologram visible from the ground should have blinded a few people in higher elevations just from the sheer number of people.
Finally, when you talk about a holographic projection on the scale of 9/11 you can't ignore the power required. You can't depend on the NY power grid, and a drain of the wattage required would have been noticed by too many people who monitor the grid system. This means your evil cabal would have had their own generators, big ones, flat-bed-truck big. They would have require long, massive cables extending to the projection systems. Someone would have seen them or they would be obvious in photographs.
Yes you are.
Profit which would forever be at risk because someone would eventually discover the plot.
Meanwhile, as I said before, they used a fantastic technology which they could have used in the open to make themselves wealthy(er), with money they wouldn't have to hide, and the prestige of every scientific award up to and including the Nobel Prize.