Im trying to find an explanation about metioned topics. But i cant find it in documentatnion, can someone point me where to Sophos is explaing it?

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Important note about SSL VPN compatibility for 20.0 MR1 with EoL SFOS versions and UTM9 OS. Learn more in the release notes.
Hello there,
Take a look at this https://docs.sophos.com/nsg/sophos-firewall/19.5/Help/en-us/webhelp/onlinehelp/AdministratorHelp/WebServer/ProtectionPolicies/WAFProtectionPolicyAdd/index.html
Regards,