Checked on latest 4.10 nightly build 4.10.0-0.nightly-2022-05-25-203355, no sources file in the installer image any more. And made a smoke testing with this build, an IPI on AWS install passed, so the installer image still works well, move this bug as VERIFIED.
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 (OpenShift Container Platform 4.10.16 bug fix update), 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-2022:4754