It's not really a customizable acronym though. If the study had some other set of survey questions, they wouldn't have put 'LGT' or 'GTQA' or something, they would have just described the group that was studied. The only subset that sees regular usage is 'LGB' and it came in to use because of transphobes pushing to exclude trans people. It's possible it was used without bad intentions (though I wouldn't bet on it), but using that acronym is spreading and reinforcing the impression that 'T' is the group that least belongs in 'LGBT'.
It's not really a customizable acronym though. If the study had some other set of survey questions, they wouldn't have put 'LGT' or 'GTQA' or something, they would have just described the group that was studied. The only subset that sees regular usage is 'LGB' and it came in to use because of transphobes pushing to exclude trans people. It's possible it was used without bad intentions (though I wouldn't bet on it), but using that acronym is spreading and reinforcing the impression that 'T' is the group that least belongs in 'LGBT'.