The national road database (Digiroad) contains bus stops ... https://vayla.fi/vaylista/aineistot/digiroad/aineisto/pysakkiaineisto . These are also visible through paikkatietoikkuna https://kartta.paikkatietoikkuna.fi/ (see map layers -> liikenneverkko -> Digiroad : joukkoliikenteen pysäkki). That should reflect the "official truth".  If there's some questions and conflicts I believe pysakit@digiroad.fi is the right place to address those.