I think I solved my own problem here. I found this post: Pass `find` results to `rclone delete` command - #4 by ncw.
I changed what I needed to on this and it worked. I had to run under sudo though. I don't understand why since the mount command says to use my user.
find ./ -name 'search_term*' -type f ! -newer /tmp/mytime | sed 's/^.\///' > filez
rclone delete --dry-run -files-from filez remote: