Germany still has living memory of the DDR and Stasi, and the revelation of their extensive surveillance is very much a culturally formative event in Germany and its sphere of influence.
You are going back in time, to the origins of the BND, post WW2 and into the Cold War.
Does it seriously surprise you that Germany as the aggresor that lost the war, became a border country to the Soviet block with a large US military presence was influenced by the CIA or other US intelligence services?
It does not surprise me to the least.
I don't think your argument is particularly strong though if all you present to make your point are well documented historic facts going back 50-70 years.
You're missing a whole lot between those times and today.
Last reference to the CIA in your first link is that the German gov. expelled several high ranking CIA officers post the mid 2010s NSA leaks.
So where are you deriving the notion from that, today, the CIA controls the BND?
Give us facts, posts, experts, discussions, anything. And recent.
IIRC GDPR is even weaker than the German law. EU-regulations usually only define the lower ceiling, and it's up to countries to go with it, or improve it even further.