In some cases you refer to "taxes" as what government charges (taxes) and in other cases you refer to "taxes" as what government collects (revenue).
Tax: A fee charged ("levied") by a government on a product, income, or activity.
Revenue: For the government, the increase in assets of governmental funds that do not increase liability or recovery of expenditure. This revenue is obtained from taxes, licenses and fees.
As anyone can plainly see, taxes are what the government charges while revenue is what the government collects as a result of charging those taxes. So using the word "taxes" as though it's a synonym for revenue is duplicitous.
Let me go back to your above statement...
...you can't argue the absurd position that higher taxes does not result in a higher percent of the GDP going to the government...
If we apply the definition of the word "tax" to your above statement, then you are the one with the absurd position that government charging higher fees results in revenue being a higher % of the GDP. Yet you claim this is not your position...
Instead, you use the word "taxes" to mean revenue. So if we take your use of the word taxes (what's charged) to mean revenue (what's collected), that would make your claim the equivalent of government collecting higher amounts of revenue results in revenue being a higher % of GDP.
If-by-whiskey: in political discourse, if-by-whiskey is a relativist fallacy where the response to a question is contingent on the questioner's opinions and use of words with strong positive or negative connotations. An if-by-whiskey argument implemented through doublespeak appears to affirm both sides of an issue, and agrees with whichever side the listener supports, in effect, taking a position without taking a position.
Is there another source of government revenue besides the taxes it collects?
I mean, sure, it could borrow more, print more money, but is that really "revenue"?
If the government's revenue depends on the taxes it collects, then doesn't revenue = tax?
If my income depends on my salary, then income = salary. That holds true until I have some investments that increase my income beyond my salary, correct? It's the same idea. The government doesn't have any income producing investments, does it?