I apologize if there was some confusion around answering your manager's question at DevConnections. In short, no, a Mac OS X machine is not required to build and publish an app using Icenium.
You can create the Certificate Signing Request that you submit to Apple for verification (through the iOS Dev Center) and upload the Mobile Provision they provide back to you (read this).
You are correct, the application is compiled on our servers. Once you've compiled the application for Publishing, you can download the app package and upload it to the AppStore, all with your Windows PC.
We are working on full publishing guidance - stay tuned for that.
the Telerik team
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