Unfortunately, this is not completely true. The visa upon arrival for Qatari RP holders only applies for certain professions and the visa has to also clearly state that the holder of the RP is a manager. I know for sure that a project manager, engineering manager, commercial manager can get a visa upon arrival but a sales manager does not.
In any way, with the current situation, good luck to you flying to Dubai, Saudi Arabia, or Bahrain with or without visa upon arrival.