Is there any message from the Flipper Zero people that this is actually their CEO? :)
Then take a look at the HN profile, which leads you to the Keybase profile.
Doesn't have any of the social "features".
I understand Keybase allows you to link up a bunch of accounts, but it doesn't prevent you from making all of those accounts say you are the CEO/CTO of some company unfortunately.
At least a GitHub profile link can usually be used to validate that this account actually has write access to a GitHub organization, so you can somewhat see it's the right person. Requires them to have pushed any public commits to within that organization though.