I did security questions by the lounge this February. I’m sure others will have more recent datapoints.
Security questions by the L52 lounge entrance is still offered, used it in late October. It isn't offered at all hours of DL departures, though (and I don't know where one finds the hours. I think it closes at 1pm but don't quote me. I know it was closed once when I was planning to use it for a 3:10p departure back to the US and was redirected back to D1)