You are getting a bit obsessed with this. It's not even guaranteed that
Google will close their server today regardless of what the initial
announcement said. For example months ago Google announced that in the
beginning of the year they would turn off the "HTML only" interface to
gmail but , as of 2024-02-21 , this remained functional. So I expect that
googlegroups will close down in the next few weeks. Perhaps it will be
today , perhaps not.