They didn't request short-term confidentiality for anything: the exhibit summary list at https://apps.fcc.gov/oetcf/eas/reports/ViewExhibitReport.cfm... has a column for short-term confidential which is all No.

Also, the confidentiality letter would specifically request short-term if they wanted it.

You are right, but today it is very difficult to get an extension to the 45 days period, unless you can provide a release date, as it has been abused so much in the past.