The bundle is a separate product that has an official release date (or "street date") set for the 23rd.

It's the same as all the other times companies release Director Cut's, Gold Editions, Game of the Year editions, etc. You're not going to get to play any of these new versions before its street date. Regardless of how long the base game has been out.

A reason for no Early Access? The bundle is mainly being marketed to the brand new player. Yes, people may get it to have on additional platforms but it's intended purpose is for new customers.

They could see it as a new person would not be able to get to 50 and complete the MSQ during the EA and would never reach Heavensward content during this window.

They could be thinking new bundle players would only be adding to server stress and it might be better to hold them off until official release to spread players a bit more. Old players will have moved on to Ishgard and new players will fill in the old zones.