Patch 1.87 says this about evade/parry
"Fossil soldiers now have improved style lines for axes, similar to the Commander style lines. They have also been given a chance to evade and have a chance to proc a defensive ability that increases their chance to parry."
So they should be able to parry and evade and I presume be able to block when they are using a shield. I can't find a way to log a subpet being hit/missed/evaded etc but I was able to make a 3 minute video fighting a boss where none of this occured.
https://youtu.be/XokaSmk84SM
