This isn't accurate. Private keys can leave this device if you opt into Ledger’s backup service. This point has already been widely discussed, so I won’t rehash sources here just DYOR. Thus, nano x doesn’t fundamentally prevent key extraction. Personally, I wouldn’t recommend using this hardware wallet as the cold storage solution for your BTC-stash.
I'll leave my thoughts here. I really liked Ledger back in 2016 - 2019, and I even had two devices: Nano S and Nano X. I used both Ledger and Trezor.
In fact, the decisions and direction the company took don't help to defend it, see any positive points (without open source and ledger recover, it's very difficult) or even recommend it.
Given this, even so, many people will still buy Ledger, because it's undeniable that the company has a very strong point in its marketing... Ledger has become the nintendo of the hardware wallet world........