Current nuclear-powered ships are run by the world’s premier naval powers and protected by their own stealth or a huge array of armed escort ships.

Have these guys factored in the cost of a task force of protective missile frigates, subs, and destroyers at each site?

Forget security (which worries me less), the legalities of this are notoriously tricky (especially if the ship might ever leave the waters of one nation), and the economics are even worse.

I wouldn’t touch civil maritime nuclear with a barge pole, and if I did, the clear win is decarbonizing big cargo ships.

Nuclear submarines often operate without any escort. Russian nuclear icebreakers and floating SMRs also do not have heavy military escorts.

I doubt Russian nuclear ice breakers have naval escort. Until recently they operated within the coverage of on-shore long range SAM systems (but most of these SAM systems were moved elsewhere recently e.g. to protect oil refineries so Northern Sea Route is no longer protected).

of course they did not calculate it! it will come later when they want to calculate real costs, they will release it after investor update

Don't be a killjoy, the bloom of harebrained ideas around AI should be celebrated!

Why would a carrier battle group be a prerequisite for this? Capital ships will have escorts anyways, the propulsion system doesn't matter.

That's a problem for the future, no need to worry investors with these silly questions.