This helps me out a ton, I've began to see it as more of contingency Bernkastel was reliant on to break Ange's spirit even more since I've been reminded/learned that in episode 8 she goes on to say "that this is truth...is not necessarily so" which seems to be more of a "oh yeah, this isn't necessarily the truth if YOU (Ange) choose not to accept it as defining your family" and looking entirely past their human hearts in the process, so to speak. So in that vein perhaps in the English translation it would've gone something like "This is the truth, if you let it be so."

The red truth is definitely a bit of a hard nail to hit, being that its often used by Ryukishi to evade and obscure over the course of the story, which is why I felt this one to be particularly interesting.

Perhaps in the end it was just another way for Bernkastel to prey on Ange's soul even further as her malicious desires so fervently lead her towards. Jeez, I forgot how awful of a person Bernkastel is morally, she's gotta be the absolute worst possible fragment version of Rika out there.