Not all Wi-Fi places require web log-in to access... there are plenty of places where it doesn't require to do that as a matter of fact.
McDonald's and Starbucks are the one of few franchise places that require it. For a sample, some Panera Bread places do require web login to access while other Panera Bread places it doesn't require.
So he apparently targeted certain places where he knew that z340 wouldn't work out and p3 would access then presented it in the video favoring p3, probably. Remember at first he was at a home or some place talking before attending McDonald's in the video... see use your "detective" common sense and you could tell if you have it.
Yet it's better to have the web log-in capability in a mobile videophone just in case one might need it at some places that may require, ofc.
Also z340 is being developed underway to add the web login browser in the near future. The p3 is a netbook with webcam included therefore he should compare it with a pc100 with laptop/webcam instead of z340, I think.
Not quite an impressive and honest comparison produced by this guy in the video, my opinion. I still would give p3 an edge for this time being, however.