they really aren't much different, its a saving. just because government likes to hide it from the books, doesn't mean you should be so gullible.
fossil fuels get huge amounts of subsidies around the world, direct and indirect. people just don't realise it as you and others have shown in this very thread.
going back to your original point, it is in no way creative tax fiddling.
It's only a saving because the oil company has to pay a tax rate significantly higher than the equivalent situation in other industries. They are still paying double the rate (in the example above, which is broadly accurate) the renewable company would be paying.
It's a bit like saying the poor subsidies the rich because the rich tax rate of 55% went down to 50%, whereas everyone else pays 20%.
Tbh it's not me that doesn't "realize", it's more you don't appear to understand the nuances of the situation, the issues with definition and the cons quenches of those differences.