Consider the consequences of your fiat lying. It's very standard, and very destructive. The problem you are having is very predictable.
Yes, about 40% of people seem to have something like your cognitive model of "lie". I've seen this and written about it in my book from 2019 on the Internet Court of Lies. I have no model -- just when people use the word in actual use and what is necessarily presupposed based on the linguistic analysis which goes across all human natural languages, and the entire globe, going back thousands of years. The word concept for "lie" is one of many word concept universals in all natural languages. That is significant for how brains compute. Here is how your brain does it:
https://medium.com/liecatcher/how-your-brain-computes-41ebe7428ff9
I've spend something over 50 years in this science and continue to find it a treasure trove in terms of revealing constraints and capabilities of neural computation.
If you think I am lying you can always bring it up as a case in the Internet Court of Lies. www.liecourt.com