Me too would want to know what kind of
Expertise in cryptography
OP has.
These are just false claims without any evidence, and he even created his forum account just two days ago to post this topic...So, I don't think he will be able to offer anything here other than lies.
Wallet recovery services are among the riskiest services nowadays, as scammerss try to exploit the lack of experience that beginners have to deceive them in various ways. Therefore, I do not advise anyone to trust these strangers who pretend to be more experienced and claim to have a proven track record in wallet recovery and similar services. Avoid seeking their help or purchasing their services, and ignore all their claims and instructions. Many people have fallen victim to these indirect scams.