Yes. The typical way to do it is that the developer (landowner, or engaged by a landowner) will set up a smaller limited company to develop just this project. When OP mentioned architect, I assume she meant the developer. OP's contract is with the developer.
The developer will then engage architects to design, engineers to do the engineering, and the main general contractors to build. Quite likely they have all worked together before.
The main general contractors will engage subcontractors. The piling guys, the kitchen guys, the flooring guys, the electricians, the carpenters, etc.
So now we have an inflation problem (which is about 7-12% in the construction industry, where previously profit margins of 5% is already considered quite good), and supply chain problems... what happens? The guys who do the real work suffer first, i.e., the subcontractors. But they are on fixed price contracts. These are small companies and they will probably go bust. Then the general contractors realize that the project will not finish unless they pump more money in, and they try to squeeze the developers, and the developers try to squeeze you. As Jim says, they can also declare bankruptcy for this small company, draw the bridge and walk away.
However, the developer will have a performance guarantee from the general contractors (otherwise banks will not finance the project). To get the performance guarantee, I would be surprised if the parent company did not have to sign a counter guarantee, so they can't simply walk away. I hope OP has seen such a performance guarantee (I asked for this when I bought, and I got it, both times).
So to sum up:
1. get together with the other buyers, and lawyer up
2. understand the setup of the developer. Who are they, who are the parent companies?
3. who are their financiers? ZKB helped finance the construction project of my current place.
4. find out if there are guarantees in place in case they go bust (this is called a Kaution, or a Bürgschaft). Usually the financiers require this as part of the security package.
5. so now you know their financiers, the performance guarantees, parental guarantees, you can demand that all of them do whatever they can to deliver that apartment at that fixed price. If they can't then do they have a reasonable suggestion? Eg., cancel the trees/bushes they were supposed to plant (just an idea).
I'm not an expert here, but some years ago I was involved in some infrastructure project financing. As a financier, I just made sure that my company get its money back if something went wrong (so I lined up a team of top lawyers on a retainer ready to quickly move in and grab everything, thus bankrupting the company), but as a (home)owner, you just want to move in, which puts the negotiations in a different light.