Why don't you ask the people that designed the ECU hack, whether they evaluated the engine for thermal and mechanical effects of such ECU hack?
Or maybe the people who designed the engine in the first place, the real engineers, and not the ECU-mod kiddies, derated the engine for a reason. Maybe that reason has to do with the oil.
We really don't know. Maybe an extra 30hp means jacking up the EGTs dramatically, or increasing the fuelling of the engine (which would result in a higher fuel loading on the oil). Only an engineering evaluation of the ECU mods that you're proposing to install would say for certain.
If you're going to modify firmware, or run an engine outside of its factory settings, you can no longer rely on factory recommendations, and you should make use of oil analysis to determine an appropriate oil and an appropriate oil change interval.