My understanding is:
- if you use the old plugin for UE 4.27, 5.0 and 5.1, then that plugin adds the support for the .TM into datasmith import. However that would work only with versions of .TM compatible with that plugin. 2023 TM files are not.
- if you only work on TM2023 and .TM coming from 2023. You just need the corresponding content plugin described above and you use udatasmith file.