The reason why there is no request to the server is because the dirty field of the dataItem is not set to "true". As stated in the help article this field determines whether the dataItem is modified or not. If this value is "false" the Kendo UI DataSource will not make a request to the server because it assumes that the dataItem is not changed.
I updated the http://dojo.telerik.com/elUkO/28 the example to change the dirty field. Now a request should be sent as expected.
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