I think you guys are missing the OP point....
This is not a glitch or a hack to beat the game... This took a rediculous amount of work to pull off in a... huh I wonder if I can do this thing that really shouldn't be done...
Each colony ship requires an Administrator to build. The number of Colony ships he would need to ferry population from other worlds to this one to boost the population is probably significant enough that once he chose to pursue this path that was the only thing his citizens went to.
And for what? His production, influence and wealth are about the same as they would be with 20 population and a few well placed starbases....
This is not an exploit... it was a proof that it could be done and probably took longer to do than winning the game had he focused on just building other things.
It is impresive though! Thanks for sharing Itrulso