Yes, nutrients are absorbed better at pH 6-7 than at 9. But.. Your RO is acidic because of dissolved carbon dioxide, carbonic acid. This is a very weak acid solution. When adding it to your containers the water and minerals already in the medium will probably raise the pH quickly.
If the pH were 5 because of a strong acid, like hydrochloric or sulfuric, it would be more of a problem. For your orchids I would use the RO without adjusting the pH.
MSU orchid fertilizers are formulated for tap/well water (which contains minerals) or for pure water. You could use a pure water MSU formulation with your RO.
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