Is my calculation for tanking artemis missiles correct

An artemis missile costs 80 metal and does 1600 damage
A krow costs 4200 and has 16000 hp.

So an artemis missile on a krow does 1600 damage which is 1/10 of its life. To repair this krow costs 420 energy (4200 * 1/10). So if you have an e/m overdrive ratio above 420/80 ~= 5.25 then tanking artemis hits with a krow is cost efficient, assuming you can repair it afterwards and won't lose it

The missile also costs energy. Also check whether the repair energy is correct.

AA missiles have their own radar homing.

another bait. if you have e.g. gunship fac in range of artemis, start a unit, stop it right at start, repeat. Artemis will shoot at 0% nanoframes. to try out: using engineer com placing nanoframes of 0% air units, are these targeted by artemis?

[Spoiler]

You can avoid the problem by setting Avoid Bad Targets to Light or higher.

I'd say nanoframe exploit has mostly been solved by the introduction of lowering the hitbox of the unfinished unit into the ground and by Avoid Bad Targets.