Hell no you ain't larping. When your transition's done & dusted you're still trans because you put in the work, put in the hours. Hours of dealing with therapist/doc/medical system BS, weekly injections/daily pills, changing your name in daily life & on documents, etc etc.
Hell, even if you're someone who's satisfied with just knowing you aren't a boy/girl/whatever but are instead a ___, & thus your transition journey might've lasted a grand total of 10 minutes you still ain't larping when you're done. At the end of the day the first & only thing that makes you trans is the 'desire to be something other than/in addition to your assigned gender at birth'. Everything else is set dressing, signaling or making yourself at home in your body, in your life.