What point are you trying to make? That reply was to an issue on the PS4, nothing to do with incorrectly revoked Steam keys.
From what they've posted on Steam there is nothing to monitor, they know what they've done wrong and that they need to correct it.
We are aware that some owners of House of Ashes on Steam, who purchased their key from one of our partners, have had their game key revoked on the platform. This is a mistake and we apologise for the inconvenience . We are currently working to
resolve this issue as soon as possible in order to restore access to all impacted players. We’ll keep you informed.
If, as it seems to be the case, Steam has no means to undo the revocation then they need to be honest with the people who've bought the game and confirm what steps they are taking to provide replacement keys, not sit silently for a week saying nothing.
I come back to my original question, why is no site reporting on the fact a company can revoke keys on a whim, with no right of appeal for the customer?
Especially when the company responsible is then sitting there saying nothing when there is an obvious and relatively easy solution, e.g. providing a replacement key program that could be implemented quickly.