I've fought Captin Tekno before and the set isn't foolproof by any stretch, I'm afraid, since I beat him. (Not sure if he was using this set, so take that with a grain of salt)
The big issue is that it doesn't do very much damage when compared to other power sets. A well placed heal here and there would completely obliterate it, as well as the fact it isn't really a perma-stun lock but instead a massive haste debuff. It has rather long cooldowns, as well.
This means that if the opponent still has the chance to do even one smart move, they could ruin the setup. It's definitely only effective in 1v1, as you said, but I don't know if it's safe to claim "Can't Touch This" just yet.
Not bad by any means, though.