I got one this past weekend, definitely handwritten, for my birthday at the end of May. Definitely a nice touch and appreciated.

As a data point, I've passed through LAX SC a grand total of once this year, in mid-April. I'd just arrived from BKK on KE, so I'd been travelling for more than 24 hours at that point and probably looks quite a bit worse for the wear, thanks primarily to the TSA mess at LAX T5. All I did at the SkyClub was take a shower and ask the hostesses to have something done about that ridiculous elevator that runs so slowly it might as well not run at all. (I was told that DL tried to do something during the SC remodel but "the city" wouldn't let them.) Not sure what got me or my birthday noticed in such a short visit, but it was nice of someone.