Swedish electricity production is essentially carbon neutral. There’s a 50/50 split between nuclear and renewables. At times, there’s imports from the European grid, which does include coal and gas &c, so by that accounting it may not be fully neutral. However, the mining industry is in the far north which has an abundance of cheap hydropower, so it’s probably true that the ore can be mined entirely using renewable energy in Sweden.

That's a great question. They've stated the aim is to electrify the whole fleet of machines and vehicles (the main transport by train has been in place for a long time[1]), including the entire mine, but I doubt there's been enough time to design/construct that kind of equipment. Information is scarce on this.

I would guess it's a bit of a marketing stunt only counting the actual production process for now (and possibly transport) for this pilot project.

BTW, the steel industry in Sweden currently eats up about 15% of the electricity production of the nation (and the two main companies together, LKAB and SSAB, are responsible for about the same percentage of all CO2 emissions). This new project, when fully operational, will require an additional 50% of the current total capacity, which will definitely be a challenge.

[1]: https://wikiless.org/wiki/Iron_Ore_Line?lang=en