It's simple: with a hundred Adepts (the rest of the army is useless), the computer is doomed to lose.
Added 2 minutes later
No need. He can and does create them properly.
I'm not talking about the fact that he creates them. I'm talking about the fact that he doesn't know when to create a phantom and who to phantom. It's like giving a miner a brush and asking him to paint a portrait. There would be more problems if he cast mass slow-dispel-poison.