Yes, I agree. That just speaks how long your OEM RTV had been sitting on the shelf at your Mazda dealer. In any events when I’m getting the OEM RTV for my ATF pan, I’d pay some attention to the expiration date making sure the one I get hasn’t been expired yet.
I've never even heard of an expiration date on RTV until you mentioned it on my tube of OEM sealant. None of my Permatex tubes have any dates on them. Neither does the tube of black RTV that came with my Fel-Pro oil pan seals for my Miata.