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Odd because I thought "interdict" meant "prohibit" but from context here it seems to be being used to mean something more like "catch".

Maybe misused or maybe a sense I'm not aware of or maybe the drones really will prohibit it by preventing them climbing up in the first place.

Your definition is definitely the historically more common one.

But see the final definition under the verb here: https://en.wiktionary.org/wiki/interdict#English

(transitive, US, military) To impede (an enemy); to interrupt or destroy (enemy communications, supply lines etc). [from 20th c.]

You see this version with the noun "interdictor" now as well.