The fact that tampering resistant (i.e. make tampering more expensive / complex) processors like developer.arm.com/products/proce require signing an NDA to learn details about the mitigations just goes to show how little faith the designers of the hardware have in their own creations.
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No, it's not possible. It's like claiming to have a lock that cannot be picked. Some level of tamper resistance is possible and can be useful, but it isn't part of the fundamentals needed to make a hardware security module useful. See the previous thread.
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A Trezor is a mini computer keeping access to the seed contained to an isolated component with on-device display / confirmation. It's wrong to expect that an attacker with physical access won't be able to extract the seed. That remains true with an obfuscated secure element too.
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