I'd guess they mean "better to have one potential attacker because of the centralization that mining with a unique ASIC would tend to cause, than to have 25 pot

I'd guess they mean "better to have one potential attacker because of the centralization that mining with a unique ASIC would tend to cause, than to have 25 potential attackers because you're vulnerable to an attack by 1/25 of worldwide GPU power (which is normally used for other coins but could be briefly repurposed)".