Correct. But one would not use the present tense to describe it. One would use the past tense.
In Judge Greer's 2000 court order (did you see it?), he states that Terri's friend quoted Terri using the present tense when discussing the unplugging of the respirator. Twice.
That led Judge Greer to conclude that the statement couldn't have been made in 1982.
I do understand your argument, but it does not paint an unequivocal timing of Terri's utterance(s) being when Terri was 11.
Did the movie come out around 1982? If Terri saw the movie for the first time based on the fight to pull the respirator around the time she had this discussion it would explain the tense in which she was discussing it.