(the WWN article almost directly says that the whole thing was Geoff's fault for not enforcing the five-second rule before declaring Doris the winner of $3,000,000)
This...might be true. Assuming that Geoff was ever told that he should always wait until the win was official before making the call, as opposed to trusting the dramatic timing of a 20-year veteran host. And I am willing to entertain the possibility that he wasn't told that and that the Lottery made him a scapegoat.
Based on the info in this topic, here's a timeline of what happened (please correct if needed) with everything but the last one happening in the span of
at most three minutes:
-Doris Barnett spins the wheel
-Wheel makes the required three revolutions for the spin to "count"
-Wheel slows down
-Ball lands in $3,000,000 space
-Geoff Edwards
immediately declares Doris the winner of $3,000,000
-Doris jumps around in excitement
-Excited jumping shakes the wheel
-Ball falls out of $3,000,000 space before the five required seconds elapse
-Ball bounces around bottom portion of wheel (as seen in the picture, nobody is yet aware of this)
-Ball lands in a $10,000 space (as family comes up?)
-Geoff looks at the wheel, realizes what happened, calms everybody down, and states that the ball fell out of the $3,000,000 and landed in the $10,000 (and, by implication, sat in the $10,000 for the required five seconds)
-(Unknown, possibly a bad reaction from Doris and/or a throw to commercial?)
-Doris sues the Lottery and wins
...So based on the info provided, it definitely looks like Geoff jumped the gun, which caused the excited jumping, which caused the wheel to shake, which caused the ball to dislodge from the $3,000,000 to the $10,000. However, as you said, whether Geoff's really at fault here depends on whether the Lottery actually told him about the five-second rule.
If they explained the rule, Geoff jumped the gun and the situation was entirely his fault. If they didn't, though, Geoff wasn't liable and the situation was entirely the Lottery's fault.