I am not sure if this is reelection campaign thing, or they are just worried about the tantrum that Trump would throw if they released the data.
It really does not matter what reason they have for this, it's a thoroughly cowardly move:
White House officials have decided not to release updated economic projections this summer, opting against publishing forecasts that would almost certainly codify an administration assessment that the coronavirus pandemic has led to a severe economic downturn, according to three people with knowledge of the decision.
The White House is supposed to unveil a federal budget proposal every February and then typically provides a “mid-session review” in July or August with updated projections on economic trends such as unemployment, inflation and economic growth.
Budget experts said they were not aware of any previous White House opting against providing forecasts in this “mid-session review” document in any other year since at least the 1970s.
“It gets them off the hook for having to say what the economic outlook looks like,” said Douglas Holtz-Eakin, a former director of the Congressional Budget Office who served as an economic adviser to the late senator John McCain (R-Ariz.).