Square taper, yes.

I'm looking to buy a compact double with cyclocross-ish chainring sizes, like maybe 36-46t. Trying to keep the cost under $80, and I'm open to buying vintage gear.

The bend in the spider isn't clearly visible, it just manifests itself in a 1-2mm chain wobble. I wouldn't know where to bend it back, and I'm reticent to rely on an aluminum crank arm that's been permanently bent twice.