This is exactly what happened to the survivors of the great tribulation. They were to be enslaved and dispersed among the nations where they have been for the last 1900+ years. This is not scheduled to happen again at or after the parousia.
What/when is the so-called 'parousia'?
Who are enslaved currently among the nations that can't return back to Isreal now if they wanted to?
You are saying Luke 21:24 happen already and is not said to happen again...what about this...Rev 11:2;13:5,7,10?
Has Joel ever been fulfilled? Joel 2:17;3:1,2