The literal root .helsinki is not in the current IANA delegation list
.helsinki is a generic top-level domain listed by IANA. Its IANA-designated manager is City of Helsinki.
The literal root .helsinki is not in the current IANA delegation list. The comparison may still show observed renewal or transfer information for existing names.
Compare any listed renewal and transfer prices for an existing .helsinki name. Those operations remain separate from the namespace’s restriction on new registrations; a historical registration tariff does not reopen registration.
Yes. The root delegation for .helsinki has a published DS record. That is not evidence that a registrar can submit DS records for an individual domain.