This link is about a proposed new eBPF verifier for the Linux kernel that doesn't use signing. As a research project it is not integrated to the kernel, but their plan does not involve trusting user space (instead they suggest doing the heavy lifting of the verification in user space and provide a proof of safety that the kernel checks, which seems sensible to me).
I believe you meant to link https://github.com/microsoft/ebpf-for-windows/ instead (discussed on HN recently) which is an implementation by Microsoft using the above research project that indeed does not follow the suggestion from the authors of the research project to use validation and does require trusting user space.
I believe you meant to link https://github.com/microsoft/ebpf-for-windows/ instead (discussed on HN recently) which is an implementation by Microsoft using the above research project that indeed does not follow the suggestion from the authors of the research project to use validation and does require trusting user space.