This is more a question for Dell than VMware/Broadcom, do your physical hosts still have support on them (which should include VxRail software support)? Also is your environment actually VCF on VxRail or just pure VxRail? I guess VxRail 4.7x aligns with a VCF on VxRail v3.x release - is there a reason you can't go to VCF 4.x or 5.x? (VxRail 7.x/8.x)?
Is the issue you're seeing an error or warning? I usually ignore some warnings from vcfverify/vxverify as it flags up a lot of rubbish but any errors you almost always need to resolve before upgrading.