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On the one hand, usual formulation is you only get one question, finding out which is the liar alone is easy but useless as then you're out of questions to actually get through the gate. On the other hand, unless you get the information about the behavior of the guards from a trusted source that isn't them you have no reason to believe them, and in fact they cannot relay the setup to you accurately without giving it away if you assume they're always like that as many do.
The full setup is that they can both tell you about the setup, but for the One Question, they follow the rules stipulated. Neither is actually bound to always lie and always tell the truth outside of the One Question.
Well yeah you can make anything work when the rules change on a whim
When you are literally making the rules yes. It's a riddle. There's no "real world application" here.
Yeah so the real full setup is that both of the guards can lie exactly once and only when asked the proper question to elicit their lie.
Yes, the exact same thing said by the person you accused of changing the rules on a whim.
No with his setup there’s different rules. My rules are the real ones
The "real" ones. I guess those are the rules "real" guards use in real life?
It's a riddle. The rules are whatever suits the riddle being presented.