Study level is pretty mich what dou make of it and also depending on your knowledge of the topic you want to study. If you want to learn how to fly a CRJ from A to B, how you have to setup the FMC, where to get the (correct) W/B calcs and the speeds from and how to use them, how to use the engines or the autopilot for your flight, the AS CRJ is perfectly capable of doing that and for that purpose this addon is absolutely „study level“.
If you want to learn the CRJ systems to a degree so you can fly non normal procedures or handle complex failures Aerosoft is definitely not the right developer and this plane is not „study level“. You can‘t „learn the CRJ“ here but you can totally learn how to fly it on a standard flight and that‘s what Aerosoft develops for.
That‘s basically the different understandings of the term „study level“. There are developers whose addons could be used as a training platform for the type rating and that‘s what many people refer to with that term.