See this thread from last year: Didn't get UCLA Scholarship Invite
In particular note the statement in post 33 that “I called the Alumni Association this morning…Regarding rumors that “everybody” got the email this year, I was told that everybody didn’t get it but they did in fact send it to a larger group than previous years.”
I don’t think anyone knows the size of that “larger” group but receiving the invitation is clearly going to be less well correlated with admission than in 2018-19 when the invitation was targeted to what was presumably deemed a more qualified subset of applicants.