No, they did not. They made it free to download, but open-access† licensing would permit third parties to legally mirror it on servers that don't block access from Algeria or Switzerland or privacy-focused browsers, and so far that licensing hadn't happened. I'm happy to see that apparently it's happening today.

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† As defined in the Berlin Declaration 22 years ago: https://openaccess.mpg.de/Berlin-Declaration

Only up to 2000. It’s unclear if the catalog from 2000 to 2025 will be fully made open. There may be legal obstacles if the originating authors and institutions don’t consent.

I haven’t been able to find anything that states otherwise. What changes in January is the policy for new publications.