You can't go by that link.
Most OS updates are sent out without even being in testing in the link.
There is some sort of approval for those OTA updates by each carrier, from
T-Mobile is the only carrier that hasn't approved the OTA update. Their
support team gave me these links.
Unfortunately that page isn't updated on a timely manner from what
I and others on this forum have seen.
gramps28 is correct, we go by what's on that page, and I have received any updates that state the Pixel 4 is undergoing testing.