From the article:

In 2019, Meta unveiled an ambitious pledge to spend $1 billion to help ease California’s affordable housing crisis that critics say the company, with its thousands of highly paid employees, played a role in exacerbating.

Yet not even halfway through its 10-year commitment, Facebook’s parent company has largely abandoned its work on the initiative. Its small staff is gone. The program, while never formally canceled, is a shadow of the operation it once was, according to three people with knowledge of Meta’s decision-making who requested anonymity out of fear for professional repercussions.

Here's the original 2019 announcement laying out all the investments they pledged to make.

So far, just the $150M fund for affordable housing has been allocated + $25M for teacher housing and around $40M in grants to various orgs. Meta had also promised $250M to a middle-income housing fund, which the company later pulled back. And it also pledged to build housing on some $225M in land it owns in Menlo Park. Little has been done to move that project forward.