The terminology 'viral gene' is not a made up fear mongering term... It's a plainly descriptive term. It is an encoding for a protein of a virus, in this case the modified c19 spike protein.

Also with regards to fundamental changes to the immune system - this is also true.

""" See: https://en.wikipedia.org/wiki/Original_antigenic_sin

Original antigenic sin, also known as antigenic imprinting or the Hoskins effect,[1] refers to the propensity of the body's immune system to preferentially utilize immunological memory based on a previous infection when a second slightly different version of that foreign pathogen (e.g. a virus or bacterium) is encountered. This leaves the immune system "trapped" by the first response it has made to each antigen, and unable to mount potentially more effective responses during subsequent infections """