"Mattison said that Harvard had promised to place a three-acre park where Barry’s Corner meets the residential community, but that the University is now reneging on that promise."Hopefully this makes it more clear...
merriam-webster.com defines "renege" as "to go back on a promise or commitment".
Take a look at Rena Park near North Harvard Street in these Harvard plans from 2007 and 2008:
|2008 Science Complex Cooperation Agreement (page 87)||2007 Harvard Draft Master Plan (page 46)|
Here is Harvard's 2012 plan (which does not include the phrase "Rena Park")
|2012 Harvard Draft Master Plan|
|Barry's Corner 10 year plan (page 36)||Long-Term Open Space Plan (page B-7)|
Notice how during the last 4 years Harvard lost the big piece of Rena Park near North Harvard Street, the Honan Library, and Mellone Park? There is a little tail of "Harvard Campus Landscape" extending to the east, but no "Public Open Space" where Harvard promised the largest open space in Rena Park.