At the current level of technology development, the first statement is correct, with the amendment that now such developers are filling the world. We do not know how to build virtual worlds only by the power of thought.
Most likely you meant virtualization using EEG. This has long been possible.
True, not figurative virtualization, but symbolic. Watch the Neurochat project, video.
100% of creating your own imaginary world in the future will take place, now there are already developments on this subject and are being tested. Vertical reality is not just computer modulation.