Thats an exaggeration of what i said but i guess in context of historical denialism it is a fair nuance to also mention. In a way your own versions of events denies the gradual escalation of evil. They did not Start with gas chambers.
This is my point more nuanced.
The Anne Frank family had lived to trough systemic suppression.
They witnessed and experienced the racism and hatred.
Deportations happend out in the open
But that is pretty close to where we are today!
Jews did not hide out of fear of gas chambers but out of fear of deportation or arrest. Just like today.
Overtime it became an open secret that deportation was very likely death. But you are still surrounded by propaganda. The exact details and extend of the real cruelty where hidden.
Looking it up: the Frank family went into hiding in July 1942. In Oktober that year Anne describes in her diary a rumor on the radio about jews being gassed. They did not wait for that escalation to hide, they started before.