All of the information given is correct - to an extent.
OW is dead on. Yes, plants have preferred pH ranges, but meandering outside of that is not a death knell.
The "pH versus nutrient availability" graph we've all seen is the result of testing of a single fertilizer formula in a single soil sample. Soils have orders of magnitude more cationic exchange capacity (CEC) than do any orchid medium, and it is that CEC that determines whether it's available to the plant or trapped in the substrate.
Unless you go way to the extremes in pH, the structure of the ionic species to be absorbed does not really change with pH, and neither does the plants' ability to take it up. In essence, "if it's in solution, the plant is able to take it up".
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