Usually with rumors, there is at least a small kernel of truth. However, in Les Miles' case, there have been so many unfounded rumors that I don't even believe the more plausible ones. I get why he's polarizing but IMO he really shouldn't be. So far, he's never said he's staying and then days or weeks later left.
Contrast that with Nick Satan saying one thing and doing another. The latest round of rumors about his return to the NFL may be false, but the best indicator of future behavior is past behavior.