An ability can counter something, but it isn't a hard-counter due to the dodgeable and momentary nature of abilities. The only exception I would say would be vs static targets which will pretty much be 100% killed with call in strikes.
There are plenty of ways to set up abilities so they can't be dodged - strafe on the edge of a map, offmap on retreat point set to hit right as retreating points arrive, etc. There is quite a disconnect right now between different offmap abilities - some are so easy to dodge they are effectively worthless, and some are nearly impossible to dodge. Many are in between. I guess I will repeat myself again - if something can quickly and easily kill your unit, and your unit cannot retaliate, then it is a hard counter. The stuka CAS strafe is an easy hard counter to jacksons - it will adjust its strafe aim even as it is mid-strafe and it is very difficult to dodge - on small maps it can be nearly impossible.