And short answer: in #C062H82UCRG it was indeed implemented with a list of files: https://github.com/nf-core/createtaxdb/blob/e561e64257492bb337a4ade1555ecb772156a0c2/workflows/createtaxdb.nf#L173-L184 rather than a directory. So

meta.yaml

is wrong. I guess this is typical 'forget to update docs' after changing the strategy as I was ahving issues with symlinks in containers.