What he said about seedsigner security ? A bitcoiner told me he will never use a seedsigner because it doesn't have any secure element and you have to trust raspberry or the reseller. For what i've understand seedsigner doesn't need a secure element because they doesn't store private keys + when the key is created or load in the device, he's never connected to internet.

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The specific thing I'm referencing / responding to is included in the writeup linked in the original post. As for what you said, you're correct: there's no attempt to store any secrets in a SeedSigner so it's irrelevant that there's no secure element. The device is never connected to the internet (there is no wifi or bluetooth hardware onboard) and, ideally, it's only ever powered via a usb battery. So no physical connection ever to any internet-connected device.