Up against that, TD Centre still retains the purity of a temple. And you don’t put billboards on a temple, unless you want to anger the gods.
It’s worth reading that article to get a viewpoint of someone who thinks of architecture as something pure and museum-like.
To me, the owners of the TD buildings are doing reasonable things with a building that functions as a work environment. You can make the argument that the building should never vary from the original intent of the architect. You can also make a good if not better counter argument that the building should be able to adapt to changes over time, and that the building should allow for the people in it to make adaptions to suit them.
The author seems to be arguing that building should remain fixed and never change, never learn. If that seems like an odd idea — that building should learn — I recommend this book: How Buildings Learn, by Stewart Brand. You can get it here. Also, if you search for it on Google, you will see alot of material derived from it.