He's not really made things very clear with either his tweet or his article.
Here's the scoop from a basketball perspective.
First of all, and I don't think anyone has made this very clear, nothing major basketball wise is going to happen for a while, perhaps even a very good while.
Secondly, the standalone facility is a PRACTICE only facility and will be under control of the athletic department - meaning they don't get bumped out of it for Bon Jovi concerts. Games will still be played at the BJC.
The timeline for this is TBD. The twenty year master plan calls for implementation in five year mini-plans. The first five year mini-plan, which begins in the 2018-19 academic year, calls for construction of a new Center For Excellence. The Center For Excellence will house a bunch of stuff but will be the central hub of the athletic department - many, probably most, of the athletic department offices will be moved there (that includes the basketball team offices). Four other projects, none of which involve basketball will happen in this first five year plan. They include a new football practice facility (replacing Holuba), upgrades to Jeffrey Field, a new Natatorium, and a new Tennis facility.
What a lot of people are missing is that the remodeling of Beaver Stadium is not included in this first five year plan. That will have to wait until at least phase two. So now you have to ask yourself, are they going to remodel the BJC or build a standalone practice hoops facility at the same time as they remodel Beaver Stadium. If I were a betting man, I would say no. My guess is the basketball related changes aren't going to be happening for a good while.
That said, the movement of many of the athletic department offices (Sandy taking care of Sandy?) out of the BJC and into the Center For Excellence, will open up space in the BJC. What they do with that space is anyone's guess? Sandy has said that there will be ongoing minor projects at the BJC. How those minor projects affect hoops is unknown?
The net of it is - nothing is probably going to happen for a good long while.