That was a page update; the recommendations to wait before testing have been in place for quite some time now. Though they were somewhat recently changed from waiting 4 days to the current standard.

...and I work for the Department of Health. Waiting has been the standard for awhile now.

https://www.cdc.gov/coronavirus/2019-ncov/symptoms-testing/testing.html#when-to-get-tested

Actually, your experience is spot on. It's recommended to wait 5 days to test if not symptomatic sooner. Earlier tests are not expected to accurately detect the virus.

According to the CDC, you need to wait 5 days unless symptomatic. Earlier tests are likely to come back negative even if the person is carrying the virus.