Finally home and got a chance to try this out; Implemented and working as expected. 
For those not yet familiar with this asset; I am using my own variation of the function is referring to, but if you need to know where it is before he puts out the patch… it is inside the BP_Grid_Manager and either in the function ‘Find Visible Pawns Step 2’ or ‘Find Tiles In Range Step 2’ if you are not using ‘Check Visibility’ for ‘Find Tiles In Range’ check.
Also: To create a function like ‘Is Tile Passable?’ without having to run an execution line through it, you will need to make sure and select the ‘Pure’ option in the function defaults.