Here is one reply on Reddit but it is not the answer:
[–]KevinTwitch 1 point 18 hours ago
Try this…. Create a new bin. Select all the clips in the timeline and drag them to that bin. That should create new clips in there….then just select all of them and batch export.
[–]andyfitts[S] 1 point 15 minutes ago
That works in the same way that exporting through Project Manager does. It does copy the source clips into the new bin, but when exported it still includes the entire source clip rather than the trimmed clip. I just spent hours nesting each individual clip; now I have 500 sequencing queued and exporting in AME. Bogus and inefficient workflow, yet the only option here I believe after far too much time researching and experimenting.