@tegusuk When I look at your website, the main thing I see is that google will assume you are print on demand, which will violate this policy: https://support.google.com/merchants/answer/6150127#:~:text=Unavailable%20promotions
With regards to the quality of the website, I would say this is good. Nothing stands out of the ordinary.
To get reviews, you can sell via other marketplaces such as Facebook, Microsoft or even the classic SEO.
I would use a websites such as https://termly.io/ for writing policies
The only way to show you have them stock is by having a track record of reviews.
I would have unique content for each product, otherwise Google will see this as a generic landing page.
Using AI is not a problem, as long as the details presented is grammaticly correct, correctly describes your product.
Yes blocking countries is an issue, you can not block countries from accessing your website, this will also be a reason for suspension.