I don't think these docs are correct for .NET Core 2.1 - see https://github.com/dotnet/corefx/issues/23422
Behaviour seems to be different between .NET Framework & .NET Core.

Document Details

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• ID: c67352df-ccc0-0cc7-51e7-998f9714580f
• Version Independent ID: 4e029cef-0c24-1f85-2e8d-c96eb4bc71ed
• Content: HttpWebRequest.AllowAutoRedirect Property (System.Net)
• Content Source: xml/System.Net/HttpWebRequest.xml
• Product: dotnet-api
• GitHub Login: @karelz
• Microsoft Alias: ncldev