Verified in Satellite 6.4.3 Snap 1 The RSS feed now points to the correct location. Additionally, the links correctly resolve to: https://www.redhat.com/en/blog/... See attached screenshot for verification.
Created attachment 1553729 [details] verification screenshot
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2019:0903