Bitwarden’s interactions with Windows Hello/Credential Manager have changed over time. grb’s comment that you pointed out was from June 2024, commenting on the prior implementation. Bitwarden doesn’t publish how these secrets are protected in detail; the details you can often glimpse are from developers’ posts, including this one from Quexten, which you probably have already seen. I think what Quexten said refers to the implementation prior to the current version.
To see the technical details of the implementation of the 2025.8.0+ versions, this PM is probably the most definitive. You would likely get the most accurate information if you dig this up yourself, because as you can see from your previous thread, the developer pretty much stated that what was said in the thread contains many inaccuracies. The Bitwarden users here who help others are unlikely to have access to more information than you do.
As someone who has used Windows Hello to unlock Bitwarden since I could, including the option “Not requiring a password on restart,” I personally would appreciate a summary or even some details you can glimpse from the PM.