IMO the AF/KLM IT tends to give random results about recognizing DL status on AF/KLM boarding passes (for AF/KLM operated flights) and on baording passes. For example, in intraEU business class on KLM, AF/KLM elites get first choice of meals, but IMO the purser/FA couldn't see my DL status.

I don't think having SkyTeam ElitePlus status on DL rather than AF/KLM affects eligibility to use the AF arrivals lounge at CDG currently, which now seems to require arrival on a long haul flight in business class for everyone, but in the past I think some AF/KLM elites were admitted after arriving in coach.