Bush got 50 million votes last time. He didn't get the 150 million votes of those who voted "D" or didn't consider him (or Gore) worthy of a vote at all. A million LPers is a drop in the bucket. Why didn't the other 149 million vote for him?
Most of them voted for Gore. A few voted for fringe candidates. And in many cases, elections were decided (state and nationally) by a small number of votes.
As it says in the LP press release, in their own words, they hope to capitalize on that and dupe enough people into falling for their BS to spoil an election...not to elect anyone. Lots of integrity there.