the error is simple.
on line notestation-to-joplin/src/nsx2joplin.py at master · andreas-vester/notestation-to-joplin · GitHub
it should be

from joplin_api import JoplinApiSync as JoplinApi

the author did not notice that I changed the JoplinApi class from "sync" to "async"
so the workarround is

from joplin_api import JoplinApiSync as JoplinApi

and nothing else has to be changed and that should work

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