It still has further requirements and conditions that you need to meet so that they can officially grant you Portuguese citizenship.
Exactly and in addition to that, it takes a very long time... In the best-case scenario, it'd take roughly seven to seven and a half years for someone to obtain their citizenship through this method
[Golden Visa application (12-18 months) > Maintaining it for 5 years > Another year for getting the citizenship in question (source)].
I would like to know what this company means by “indirectly” holding Bitcoin,
They're referring to ETFs.