That says unit cost is $52,914. Not cheap by most standards. Yes, cheap compared to military aircraft, but the interesting changes around doctrine are happening at cheap enough to be disposable.
I am aware that missiles and torpedoes are very expensive. Disposable drones are changing doctrine in ways that more expensive missiles and torpedoes do not.
Cheaper than a missile, which are launched in the thousands in any operation, without any expectation that one specific missile will do any one specific thing, should be plenty cheap enough to consider each of these drones disposable.