Submitted to @team for approval:
In particular, as noted by @Overall-Bet3743, both these highlighted statements from Proton appear to be incorrect in my testing:
Please note that our regular kill switch feature can’t protect you if you intentionally disconnect from a VPN server. However, the feature does protect you while switching servers with Proton VPN.
Important note: As we have reported, Apple’s macOS and iOS operating systems don’t close all existing connections when you connect to a VPN, specifically certain DNS queries from Apple services, even with the kill switch turned on. However, the kill switch will block all non-Apple connections. We’re aware of this issue, and are working towards a possible fix.