Enable skippable content for SRPMs on an existing repo

Problem:

After updating to Katello 3.7, I enabled skippable content for an existing repo for Oracle Linux 7 latest in an attempt to clean up the 5900+ SRPMs in the repo that I don’t want to keep. I also ensured that Mirror on Sync was enabled. I ran a synch and it seems like the SRPMs are still there (Content Count is still 5979 SRPMs for the repo). I also checked the HTTP published Library repo and I see plenty of .src.rpm files remain.

Expected outcome:

I expected that once the sync completed, the Content Counts would reflect a zero count for Source RPMs.

Foreman and Proxy versions:

Foreman 1.18 (Katello 3.7)

Foreman and Proxy plugin versions:

Other relevant data:

Do I need to rebuld the repo?