Does the equip keyword count as choosing/targeting a unit?

Ruling: Yes, equipping targets a unit. When you attach an equipment to a unit you control, you are choosing that unit, which makes it a target under the current rules.

Nuances:

• The determination is based on the criteria that you (and only you) are choosing a unit, it's not a replacement effect, cost, or trigger condition, it's not programmatically selected, and it's not part of an instruction you "must" complete.