Iván has already lost a channel in 2016. It was first upload-disabled in February and then terminated in July of that year. (story)
Besides his Angry German Kid series, he also made some spin-off content like "Top 15 AGK parodists" (also long gone, as you might have guessed).
The possibility of having an entire channel with all its content nuked due to strikes on a tiny fraction of videos makes YouTube hostile to long-term archival. A wise man once said something along the lines of "Google is an archive in the same way a supermarket is a food museum".