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If the total eosinophil count is normal but the eosinophil percentage is high, is it considered eosinophilia, or is it merely grounds for a rerun of the test?

In a paper by Kovalski and Weller (2016), I read that:

Hence, eosinophilia is often recognized based on an elevation of eosinophils in the blood. Absolute eosinophil counts exceeding 450 to 550 cells/µL, depending on laboratory standards, are reported as elevated. Percentages generally above 5% of the differential are regarded as elevated in most institutions, although the absolute count should be calculated before a determination of eosinophilia is made. This is done by multiplying the total white cell count by the percentage of eosinophils.

It confuses me a bit. What is the main criterion defining eosinophilia - the percentage or the absolute count? Or is it either?

I tried googling but there seems to be no simple explanation.

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