That it is logically possible that any extralogical statement we believe true is false is, of course, vacuous full stop. Instead of calling it "near vacuous", I should, perhaps, have said "nearly innocuous". The claim is utterly innocuous as long as one is not tempted to conclude that the logical possibility that an extralogical statement is false ought always to be taken seriously. But the temptation seems to be quite strong and attracts followers of the thesis of fallibilism which is far from vacuous or innocuous.