I cannot find a download to anything but U2a. ???
Check under the 7.0.0 heading. For some reason patch 1c was there as well and not under its own category.
I just built an image using Lifecycle Manager and exported it , then used it as a baseline to remediate my other cluster
Are you just pulling the patch and not the ISO?
The only ISO I find is "VMware vSphere Hypervisor (ESXi) 7.0U2a".