nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpq0fp3ehl8utp98zgk6lx87uwkfxm9zq6z9varapeuluz9cdf3zfvs0udffe (nprofile…dffe) I think text/html is the correct mimetype for that file. The problem for a podcast player it's the content, it's a normal webpage for user to read not the format proposed on the spec to be parsed programmatically.
https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/tags/transcript.md
https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/examples/transcripts/transcripts.md#html
nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqgnsmewzn4uw62frg8zngy3m8g2nlcr23nt2g5wxa497anmf4ys6qrezwqe (nprofile…zwqe) nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqln5q8np5aezhtt7ztv6tah86xk4t3smjuchdvxp0u6uta056204qlatd70 (nprofile…td70)