Well, to be fair, they are right in thinking of that, since the definition of a star is:
A self-luminous celestial body consisting of a mass of gas held together by its own gravity in which the energy generated by nuclear reactions in the interior is balanced by the outflow of energy to the surface, and the inward-directed gravitational forces are balanced by the outward-directed gas and radiation pressures.
Of course that means that the fusion reaction in the experiment is MOST DEFINITELY NOT a star.