you need to read more carefully.

Banzer banned all the left-leaning parties, suspended the powerful Central Obrera Boliviana, and closed the nation's universities. "Order" was now the paramount aim, and no means were spared to restore authority and stifle dissent. Buoyed by the initial legitimacy provided by Paz and Gutierrez's support, the dictator ruled with a measure of civilian support until 1974, when the main parties realized he did not intend to hold elections and was instead using them to perpetuate himself in power. At that point, Banzer dispensed with all pretenses and banned all political activity, exiled all major leaders (Paz Estenssoro included), and proceeded to rule henceforth solely with military support.