I think it's unfair to call Ladybird vaporware this early. There's nothing suspicious about their development schedule for the scope of the thing they're trying to build.
I agree I don't think it should be in the alternative browser discussion until they do produce something, however.
Then they wouldn't be throwing money into open firepits on trash like a VPN service or how to comply with Google's advertising decisions.
Then they would let people contribute money to the browser (instead of to Mozilla Foundation which goes to enabling aforementioned trash fires) and to the salary of a multi-million dollar CEO after laying off developer staff and hiring more C-suite assistants.
Mozilla is a bad organization in every sense, a bad steward of Firefox, and the best thing that could happen is they do have their funding cut, they go out of business forever, and Firefox finds a good home chosen by the community.
A better question would be "can I use PowerBI on Linux?", to which the answer is "no". This is assuming the obvious "use the web app" or "run a VM or other Windows mimicking layer" was already considered and dismissed.
I agree I don't think it should be in the alternative browser discussion until they do produce something, however.