Well MY doesn't matter much in terms of AMGs. They don't change year to year. You may want to check the date the car was built as I've seen AMGs labelled a year newer than they actually are. Again, it doesn't really matter, but I do find it disingenuous. I don't know about a lease for AMGs. I didn't. I suspect the Pull Ahead wouldn't apply to AMGs as they are a specialized vehicle that operates under different situations than regular Mercs.
You may also want to call and see if that CLA45 is actually in stock. I saw many times a dealer would list it in the website and find out that it was someone's order. I think they do it just so they can get foot traffic and to get a display. In fact they did that at a local dealership with a professional athlete's AMG while they were overseas. I'm not sure that athlete would've been happy to know their ordered AMG was sitting as a display vehicle for everyone to sit in before they got it.
I got my CLA45 about 5 months ago after waiting for 13 months for them to build it.