LOL right. The CBO itself admits that it makes errors in its projections and that it cannot perfectly predict the future. The CBO underestimated spending in some areas, such as Medicaid expansion under the Affordable Care Act, where it underestimated enrollment. It overestimated spending in other areas, such as the cost of certain tax cuts, as well as underestimating the deficit impact of legislation, while in others it has overestimated it.
Economic downturns have in the past significantly impacted the CBO's projections, leading to larger-than-expected deficits. Unforeseen events like the COVID-19 pandemic also lead to inaccuracies in their projections. The The CBO's projections are based on current law and assumptions about future economic conditions, which are subject to change.