Who is Andrew Hammel?
American resident in Germany since 2003 and non-practicing attorney, translator... other stuff.
He used to have a blog about immigration to Germany pointing out things that German media (generally awful) never talked about or tried to wish away...
And the analysis isn't his, the link to the story is in the tweet....
As he points out, if you make it to Germany and don't want to leave... it's pretty sure that Germany will never be able to deport you..
Many of those since 2014 are illiterate in their own languages so the idea that they can quickly learn the local language, local ways and become contributing members of society is basically magical thinking.