So lets look at what crowdfunding is.
On Kickstarter, GofundMe, Fig etc when you make your pitch you have a goal in mind, typically an upper amount for your project to be successful. And so when people purchase one of the options on offer they are all pitching in to reach that goal.
When stretch goals are added it is the same thing, they have a target and anyone who has pitched in or pitches in is contributing towards achieving that target and typically reaching a stretch goal target unlocks that feature for everyone that has contributed.
It is a group effort (hence crowd) and there is a specific target in mind.
Star Citizen stopped this style of funding at $65 million. Everything that has been sold since is done in an individualistic manner. They put something in the store and a person buys it or pre-purchases it, end of story. There is no group effort to reach a target and nothing is unlocked for the group.
It is no different that buying things from Amazon or Walmart or any other online store front and they certainly aren't crowdfunding