Bukele’s policies against crime themselves are just a continuation of previous work done by prior administrations, and it helps that this time has only been successful as Bukele and his colleagues want to maximize power in the country and aren’t doing this for show. That and the fact that gangs are so normalized to a massive extent that they existed so long openly and could negotiate with the government made them easy to find.
The gang hierarchy still exists behind bars and now El Salvador is at the administration of an insane elitist.
To what extent is that meaningful, though.
As long as the hierarchy exists, once they get out they can reestablish themselves back on the streets. Prison gangs are often even more dangerous than those with their leadership out on the streets.