Please give a legit explanation why team Thailand lost two points and does not allow substitutions s

As a volleyball fan, not only a fan of Thai national team but also fan of FIVB world tournament. I usually trust in the standard and value of the organization especialy when it organized for the olympic qualify which it the highest goal for most of the athlete who want to join the tournament just once in a lifetime, to honour themself, honour their country because this is the tournament of the humanity which bring the whole world together. However, the value and honour of the olympic may decrease by some controversual situation in the qualification round, if someone qualified by the trick or unfaired judgement then it's no longer worth enough to join the game, and the value of the game was contaminated by that unfaire judgement. Hope The FIVB review about this controversial situation to promote the best thing about volleyball to the world.