Unfortunately, yes, the RPM Deployment Wizard is no longer available. It was part of the ‘Linux RPM Patching’ site, which was deprecated in 2017.
Please see https://help.hcltechsw.com/bigfix/10.0/patch/Patch/Patch_CentOS/c_use_the_rpm_deployment_wizard.html and IBM BigFix Patch to deprecate and end support for Linux RPM Patching site on September 29, 2017 for reference.
That said, do please note that RPM deployment is available/supported with Software Distribution: https://help.hcltechsw.com/bigfix/10.0/lifecycle/Lifecycle/SWD_Users_Guide/c_frequently_asked_questions.html