Why doesn't revitalize work on bonus health regen?

1. I'm talking about bonus health regeneration from champion passives/abilities, not from items. Example champions being {{champion:36}} {{champion:86}} {{champion:27}} {{champion:106}} It says it increases all healing you cast and receive by 5%(10% if the target is below 40% or so hp) but it doesn't work on champion heals which are massive health regeneration boosts. Volibear and Mundo are the best examples for this. I thought revitalize would increase Volibear's passive healing but it doesn't. Unless there is a balance or a coding issue for why it doesn't? Edit: meant to say cast and receive for revitalize
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