Does this bike conform with US CPSC requirements for import and sale in the US?
The answer is: No, it doesn't in the present design.
I've been studying the Consumer Products Safety Commission (CPSCO) regulations on bicycles. One requirement is that any bike with a single chain sprocket in front and a single sprocket in the rear must have a chain guard that meets certain specifications. Basically, the guard has to look like the ones commonly seen on cruiser bikes, covering at least 90 degrees of the chainring sprocket and extending to within 3.5" of the rear chain sprocket. These regulations are enforced in 3 ways. At the port of entry, to get through US Customs, any shipment of bicycles must have a Certificate of Conformance with the shipment or available online to the customs officers. The certificate is a legal document which the importer or manufacturer must produce, certifying that the product meets CPSC regulations in all regards. Second, the CPSC can order sellers to stop selling non-conforming bikes and to recall them (either to rectify the non-conformance or to refund the buyer). Third, if a consumer sues, the courts will look unkindly upon an injury due to a non-compliance, by the seller and/or manufacturer, with product safety regulations.
Filing a false certificate is subject to civil and criminal penalties. Border officers won't (are not supposed to anyway) release the shipment for pickup or delivery inside the US unless the product is certified as compliant. They would notify the importer, who has a certain number of days to provide the certification document, or to ship it back outside of the US, or otherwise the customs department will seize and destroy the shipment. I saw an article about a Land Rover 4x4 vehicle worth $100,000, which was seized and crushed because it didn't conform with the requirement for all vehicles manufactured in the last 25 years to have airbags. They routinely seize and destroy all sorts of products: counterfeit brand-name products, children's products that have lead paint or unsafe small parts, etc. Single items that come in as manufacturer's samples are exempt. So are custom-made bikes rather than factory made in quantities. But other than the few exceptions, all bikes sold in the US must meet the CPSC requirement. If somehow a seller doesn't comply and sells a non-conforming bike that is subject to the requirements, and someone is injured due to a manufacturing defect, it would be difficult to defend. Liability insurance does not cover willful acts that are illegal. Compliance requires testing to the specific standards for bicycles set forth in the CPSC regulations in the Code of Federal Regulations.
So unless the manufacturer can figure out how to add the chain guard to this unusual folding design, importing this bike for sale would be prohibited in the US. The regulations also require front and rear reflectors, which would be easy to add, and various strength testings (braking power, fork strength, axle retention in the fork, etc.).
What puzzles me is that I see many single-speed or fixie bikes on the road and advertised by online sellers, which have no chain guard or only a simple ring around the crank chainring, which does not meet the legal requirement unless the front or rear has multiple sprockets (multi-speed gearing) and obviously a single-speed bike does not. How do those non-conforming bikes get imported? Are the importers submitting false certifications? Is the US Customs and Border Protection agency just turning a blind eye to the details of the certification? Does anyone have any experience with this?