Is the component of Sword Coast Stratagems II which gives high-level enemy NPCs HLAs compatible with the Refinements mod, considering Refinements gives new HLA tables to each class?

I think you should be ok if you installs SCSII last. Otherwise ask DavidW himself.

The question is moot, since SCSII requires TOB. I assume you only have SOA (given which forum you posted in), so you can't play SCSII anyway.

I assume he posted it in the wrong forum, so I'll move it to the ToB forum.

Is the component of Sword Coast Stratagems II which gives high-level enemy NPCs HLAs compatible with the Refinements mod, considering Refinements gives new HLA tables to each class?

It's compatible in the weak sense that nothing will break. But the enemy NPCs will use the old HLAs, not the Refinements ones.