“The scripture you cited contradicts your assertion”
Nope.
“It is only when we see the culmination of these signs coming to pass that Christ’s return is imminent; ‘Luke 21:28 Now when these things begin to happen, look up and lift up your heads, because your redemption draws near.’”
There is no contradiction here. There is a series of signs before Christ’s return and the Day of the Lord. The early signs include antichrist deception, wars, famine, and disease. Jesus did not say His return would be imminent and to look up then. He said the opposite:
Luke 21:9
But when you hear of wars and commotions, do not be terrified; for these things must come to pass first, but the end will not come immediately.
ALL 6 signs must take place BEFORE Christ returns, and the “end” comes. So He says to look up for His imminent return when the signs come to pass, not when they are just getting started. There have been many wars, famines, and plagues down through history. None of them indicated that the Lord’s return was imminent. But when we see the other signs follow these things in sequence, and the revealing of the antichrist in particular, we know His return is about to happen. No contradiction here.
“the passage was from Luke and given during the Temple discourse, not the Mount of Olives discourse”
Nope.
The Olivet Discourse is the teaching of Christ found in the Synoptic Gospels in Matthew 24, Mark 13, and Luke 21. Jesus was going back and forth between the Temple in the day and the Mount of Olives at night because the Jewish leaders had basically issued a warrant for His arrest.
Luke 21:37-38
And in the daytime He was teaching in the temple, but at night He went out and stayed on the mountain called Olivet. Then early in the morning all the people came to Him in the temple to hear Him.
By comparing the three passages, we can see clearly that Jesus was saying these words after leaving the temple and returning to the Mount of Olives.
Matthew 24:3
Now as He sat on the Mount of Olives, the disciples came to Him privately...
Mark 13:3
Now as He sat on the Mount of Olives opposite the temple...
Luke leaves out that part of the passage took place in the Treasury inside of the temple, part was outside of the temple, and part was across from the temple on the Mount of Olives. Most of the prophetic teaching was not done so publicly in the temple but privately on the mountain.
Today, the walking distance between the mountain and the temple mount is a little over a mile because it is not a straight shot. It was probably about a mile when the Olivet Discourse took place.
What I quoted is part of the Olivet Discourse. You should research a little more carefully before attempting to correct something that isn’t incorrect to begin with.
Perhaps a netter word than ‘culmination’ would help. Do you know what that word means?
The Luke Discourse is not the same as the Matthew and Mark citations from the Mount of Olives. A more careful comparison would help, if you are open to learning not just unlearning.