this "further analysis" is comically biased, misinformed, misapplied mush. It's honestly like a gish gallop to quote this shit. Well, I read it, so I'm going to take the time.
> produce a negative financial benefit over their lifetimes
This is an absolute lie, pulled from the trash. Maybe you just didn't understand it -- I hope!
Claiming that either the distribution of contributions across ages, or the "age adjusted average net contributions" graph portray some kind of a "long term" picture of what people's contributions over the next two generations would be is a fundamental misunderstanding of what the graph and data represent, or is capable of representing.
The first chart is simply a calculation of contribution in 2018 by age. The second is a remapping of 2018's immigrant population's 2018 contributions and costs from their then-age distribution to proportions equivalent to the then danish-native age distribution. It has nothing to do with either populations' prospective future contributions. It's just a convolution of data which is presently skewed by extreme circumstance, i.e. being an active asylum seeker by definition means you are recently economically unstable, and far more likely to be a member of specific age demographics. It is not a projection of any likely future; it is solely a lens to remove one confounding factor -- the very different age distributions of the instantaneous populations compared -- for the purpose of comparing their 2018 contributions directly.
And then it goes off into justifying its conclusions by comparing "countries by IQ"?! Pure hack slop, and nothing else. There's references to coronavirus lies, and this being "an immigrant invasion" -- this is not remotely convincing nor unbiased, nor even an interesting analysis. It is just kinda long and filled with errors. Like I said: bit of a gish gallop.
To draw from it, and parrot its erroneous claims like they should convince us as they convinced you, the disinterested and enlightened scientist, is a new nadir on your dismal intellectual track record.