The context of Sacks’s comment is the CDC’s mask / transmission guidance for vaccinated people in light of Delta (“there’s new information here… Even the CDC hasn’t officially changed their policy yet… it’s coming”).

In reality, the CDC had already made that policy change before this episode was released:

• On July 27, 2021, CDC updated its Interim Public Health Recommendations for Fully Vaccinated People in response to the Delta variant, now recommending that fully vaccinated people wear masks in public indoor settings in areas of substantial or high transmission, and explicitly noting new evidence that vaccinated people infected with Delta can spread the virus. (stacks.cdc.gov)
• This updated guidance is dated July 27/28, 2021 in CDC’s archived materials and contemporaneous summaries. (stacks.cdc.gov)
• The All‑In E42 episode was published on July 30, 2021, i.e., three days after the CDC change. (glasp.co)

Sacks’s line about “we’ve predicted the policy change on this show anywhere from two weeks to two months before they actually do it” is presented as applying to the impending CDC shift he is describing (“it’s coming, right? we know it’s coming”), but by release time that shift had already occurred.

Within the two‑weeks‑to‑two‑months window after July 30, 2021, CDC did adjust vaccine-dosing policy (e.g., on August 13, 2021 ACIP/CDC recommended an additional mRNA dose for moderately to severely immunocompromised people, and on September 23, 2021 recommended certain Pfizer boosters). (pmc.ncbi.nlm.nih.gov) However, these were about extra doses, not the mask/transmission guidance he was explicitly talking about, which had already been revised on July 27.

Because the key CDC policy change on vaccinated masking and Delta transmission happened before the episode rather than within the “two weeks to two months after” window Sacks implied, the prediction — as normalized here — is best scored as wrong.