I don't think deleting the module makes sense even if the API was deprecated in full (deprecation means "you shouldn't", not "you musn't"). However, this:

Specifically, the US Privacy String will be deprecated, while the Data Deletion Request Handling mechanism will retain continued support beyond September 30th

is a more compelling reason to keep it.

A very interesting, non-breaking change has come up as a proposal: remove the usp object from the bid request but keep the module around

Another action: we could remove the module as recommended download on the download page

At this time IAB has not produced a convincing argument to stop using USP API as a signal to vendors nor have we received signals from our vendors to stop using USP API.

At this time I would advise not removing the USP API module from Prebid. I advise this in order to retain Prebid's state of matching the actual state of the environment--including at anticipated time of version release--and based on the current state of vendor documentation, most notably Google.

Noting this can kicked down the road again to January, some people asking for March

Removing prebid 9 tag