Yes, you're right, and Antony really found a great environment at Real Betis, which made him very eager to join this La Liga club. He even said that he rejected an offer from Bayern Munich because he only wanted to go to Real Betis. Wow, he was on loan at Betis last season for a few months and has found his home.
Even if he chooses Bayern Munich, it is not certain that he will play as a main player because Bayern Munich already has good players, he might only be used as a reserve option which means the same fate as at Manchester United so choosing Real Betis is the right choice because he will be a main player for the team and he is also not in a team that is full of pressure. Real Betis is usually just an average team that is not bad and not too good but at least it is better than a weak team that is around the relegation zone.