No. Only Berlin / Brandenburg people say "Ik". Southern German dialects say "I" (pronounced as "ee" would be in English).
No. Only Berlin / Brandenburg people say "Ik". Southern German dialects say "I" (pronounced as "ee" would be in English).
Precisely people in Berlin/Brandenburg say "ik" _because it is Low German, which is spoken in the North of Germany, which is what the Uerdinge isogloss describes_.
The article did fail to mention the other big lines, the Benrather and the Speyer line (which is what you are referring to with Oberdeutsch dialect differentiating between "ich" and "i").
There are a lot of these lines drawn by linguists.
I found the article a bit disingenuous since you need to know what the Uerdingen line is and its context to understand what they're saying, since the divide isn't quite what it used to be.