A lot of people reported that they did. I don’t know why. Nothing in their statement said that. They did say they were going to add some “advanced workflows” but didn’t elaborate anymore than that. It says it right in the link in OP:

Update: Google has not “backed down” from developer verification: Contrary to a vague mention of a possible “advanced flow” that may eventually allow “experienced users to accept the risks of installing software that isn’t verified”, Google’s description of the program continues to state plainly that: “Starting in September 2026, Android will require all apps to be registered by verified developers in order to be installed on certified Android devices”. Until such time that they have shown evidence that it will be possible to bypass the verification process without undue friction, we must believe what is stated on their official page: that all apps from non-registered developers will be blocked once their lock-down goes into effect.