Within a communal /mixed orchid collection an average ph can be settled on, but if specialist like phragmipedium the correct ph would be more an objective in terms of slightly acidic than alkaline. This would contribute to a better orchid care approach and or improved orchid cultivation.
With this factor and many other requirements needed for healthy root system a high nitrogen feed would aid the plant but in terms of improving uptake i.e the phloem (what the plant uses as a means of transporting water/ nutrient up into a plant, i have not yet encounted anything research wise to corroborate it. Any chance of a link to this article? sounds interesting.
The element of strong / good healthy plant, good growth with good care IMHO is purely the best one can do or help to achieve as the plant is in 'optimum health' inorder to carry out the science bit thats required in its genetics/ instinct.
Foliar spraying/ feeding has also been strongly recommended as the plant uses its 'stomata' in leaf to also absorb. Possibly an evolutionary development and used as a back-up plan if natures forces disrupt its situ in habitat. The stomata will therefore aid in absorbtion of systemic.?
So yes to high nitrogen feed being linked with pesticide increasing intake indirectly as a boost (due to plant in top health), but as for direct/ instant or immediate as a direct result of using the two as an equation thats a question and a half.