All who are not taken up to meet the Lord in the air when He comes will be left behind and killed.

[Spiritual Israelite]

The enemies that were slayed when the noblemen returns- are the ones from the beginning of the parable, who reject the nobleman PRIOR to him going on a journey.

Yes, but the parable relates to Jesus giving rewards and punishments, so it's talking about them being brought before Him when He returns to sit on His throne to judge all people, as we can see portrayed in Matthew 25:31-46. So, that parable in Luke 19 is not referring to their physical destruction that occurred in 70 AD, but rather is referring to them being brought before His throne at the judgment in the future when He returns and then being cast into the lake of fire prepared for the devil and his angels.

 

[Scott Downey]

The enemies that were slayed when the noblemen returns- are the ones from the beginning of the parable, who reject the nobleman PRIOR to him going on a journey.

It is a parable, does not have to be an exact fit.
The main point is Christ destroys all His enemies at His return

That means those who are unrighteous, anyone who does not believe in Him or know God.

Now what do you make of this, in v30, anyone who is not with Christ is Christ's enemy when He returns

29 Or how can one enter a strong man’s house and plunder his goods, unless he first binds the strong man? And then he will plunder his house.

30 He who is not with Me is against Me, and he who does not gather with Me scatters abroad.

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There are no neutral persons.
Example of this

Ephesians 2
And you He made alive, who were dead in trespasses and sins, 2 in which you once walked according to the [a]course of this world, according to the prince of the power of the air, the spirit who now works in the sons of disobedience,

3 among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others.