I knew someone who was a twelve year old in a safe house under the protection of Wallenberg during the holocaust . He for his part was obsessed with the holocaust and his experiences. None of the Polish survivors I knew, who all went through so much more and worse were obsessed like that.
Anyway, there are different levels of being a holocaust survivor . The secular definition is anyone who went through Nazi persecution. Someone who was a child in Germany and left with his family in 1936 because of the way they winds were blowing is considered a holocaust survivor just like someone who went through six years of torture in Poland. There is an ulterior motive behind why the secular world stretches the definition so much. That way the holocaust is barley unique.
I think it depends on what someone went through. Even being in a safe house was terrible . But being someone who is worthy of giving brochas on par with a Gadol B’Yisroel because they went through the holocaust and remained frum is something I would only say about someone who was in actual concentration camps. Or an extended period in a ghetto. Or years of hiding in a forest . Etc.