No problem, I restored the tags to the bus stop.

Stop H1492 seems to be a local bus ('lähibussi') stop, which is only identified by small blue shield in a pole somewhere. It's in Reittiopas and has a line (34) stopping on it, so it's likely valid.

Hopeakuun pysäkki (E3273) näyttäisi reittioppaan mukaan olevan käytössä?

Tässä oli myös Vantaan rajoilta lähtenyt 'boundary=administrative' tagi pois. Palautin.

osm.org/changeset/162079144

No, and I don't think fixing non-standard tags requires discussion.

Reverting this (and other similar tags in Finland) would also break public transport routing to the entrances in question.

Isn't there another tag you could use to indicate that the address is to a staircase, if that's important?