portmanteau :
I think they would know more about such matters than yourself.
To be honest with you I doubt they do. These statements look to me as just face saving exercises to hide their own regulatory shortcomings.
Unless Bolivia filed a difference with ICAO on Flight plan handling (mind you they might, I have no real wish to spend the time looking for it) under normal worldwide accepted standards, an ARO cannot refuse to transmit a PLN based on EET/Endurance figures.
Responsibility for filing those values and signing for it are the Pilot in Command and him alone.
As to the TWR Controller he would not know since those details are not part of ATC flight plan processing. End of story.
Explained already before .
Do not take for granted everything that "officials" are saying.