To be considered a True God, one had to have ignited Divine Fire and also have achieved an understanding of the existence of God Rule Power or Elemental Enlightenment.
Because Divine Power within the body was refined by the Divine Fire, the quality of Divine Power possessed by true god-level powerhouses far outstripped that of Virtual Gods. Once that was combined with God Rule Power and Elemental Enlightenment, it became an irrefutable universal truth.
Therefore, a Virtual God challenging a True God would be as hard as scaling the heavens.
Apart from a very few peak virtual god-level genius powerhouses who had mastered God Rule Powers or Elemental Enlightenment and could, therefore, challenge True Gods, other Virtual Gods would not stand a chance of winning an encounter with a True God.
Lin Huang dared to challenge True Gods for a very simple reason.