Fluke championship is an opinion and a bad one at that, it's not backed by facts or any consistent metric only opinion based on the individual claiming the fluke, it basically argues that unless all contending teams are healthy then that years champions are illegitimate, that's stupid.
It wasn't a fluke that the Knicks were injured, they made the choice to run their starters into the ground to make it as far as they did, nobody slipped on a banana peel thrown on the court, that would be a fluke, What that was is a strategy that backfired.
And im I'll still be waiting for you to name the year where every single competitive team had every player available and nothing out of their control went wrong. Because according to you that's the only way to win a legitimate championship and that makes no sense.
Ultimately like you said, there will be no asterisk, most people will forget about any bullshit narrative in a few years for the next bullshit narrative and your personal opinion means less than nothing when it comes to how championships will be remembered.