United Timatic still lists it, but looks like the fixed the website. Am I confusing two different things?

Warning: Passengers must have: - a COVID-19 vaccination certificate showing that they were fully vaccinated; or - a negative COVID-19 PCR test taken at most 48 hours before boarding of the last direct flight to Chile. This does not apply to passengers younger than 18 years. A completed "SAG Affidavit" must be presented upon arrival. The form can be submitted online before departure at www.sagingresoachile.cl. This does not apply to passengers younger than 18 years.