I wouldn't trust any closed source devices like Ellipal Titan with their claims, especially knowing their history of exploits.
Another case in history I remember is when one guy opened Keystone device and there was not self-wipe happening.
I didn't investigate this subject deeper but I am sure Satochip and Keycard are using something similar, since they are based on secure elements in java cards, just like in payment cards.
This ''protection'' doesn't really exist unless it is well documented and confirmed by independent testing.

 

Hackers just lack Dremel tool to open wallets  .


Probably wallets sturdy design, which prevents testing without physically damaging the device, answers your concern about the existence of independent research.

For me the main reason that stops me from buying such wallets is their built‑in battery. Sure, the removable battery isn’t compatible with the tear‑down‑proof design, but the latter would be the last thing I’d worry about.