The LTE chip already exists and will be in production in the next few months - the MDM9615.
The post you quoted is from about 9 months ago. When it was written, it was absolutely true. Also, when this thread started, people were referencing what we now know is the iPhone 4S. The title of the thread threw me for a loop too, but noticing the dates of posts, things started to make more sense. This rumor was effectively debunked already as the phone in question already released on all carriers WITHOUT 4G LTE.