Level 4
It still isn't because Kaspersky is stubbon and want to continue to rely on their hooks and their own hypervisor that break security instead of improving it. Look at their insane security recommendations:

Screenshot 2020-09-17 at 19.13.15.png

Imagine if someone on this site or anywhere else on the Internet said "just turn off Core Isolation/Device Guard/Virtualization Based Security for your AV to work." Kaspersky logic:

Over the past few years it's gotten less and less compatible and it seems Kaspersky is not interested in adapting to Microsoft's new features and using their hypervisor instead.