Donga never expected to fight and just wanted to shit-talk about fighting IRL, but Tara fucked him by taking him seriously and setting it up.
To me it seems really obvious what happened. This is the homosexual planning session that ensued:
Donga went to the promoter/owner and told them Andy was going to make a bomb threat. To make it more believable he also falsely claimed Andy had doxed and harassed his family tribe. I think the motivation here was to spook the promoter/owner into cancelling the fight so as to avoid the possible bomb threat ruining the entire event. The spin would then be that Andy's spergy behavior is what killed the fight. Donga win!
This plan failed because rather than cancelling, they said they were going to simply added some sort of sabotage clause. When Donga realized this he (with only days left and no other options) simply failed to turn in all his paperwork on time. This is a less optimal way to weasel out of the fight, but it gets the job done.
The name change thing is the most lolcow nonsense I've ever heard and it's not real, he is not actually changing his name. He is just fucking things up by signing different names, and now he is pretending that he changed it. He didn't.