I think this is the exact regulation Sondors would be subject to;
16 CFR § 1110.7 Who must certify and provide a certificate.
(a)
Imports. Except as otherwise provided in a specific standard, in the case of a product manufactured outside the United States, only
the importer must certify in accordance with, and provide the certificate required by, CPSA section 14(a) as applicable, that the product or shipment in question complies with all applicable CPSA rules and all similar rules, bans, standards, and regulations applicable to the product or shipment under any other Act enforced by the Commission.
(b)
Domestic products. Except as otherwise provided in a specific standard, in the case of a product manufactured in the United States, only the manufacturer must certify in accordance with, and provide the certificate required by, CPSA section 14(a) as applicable, that the product or shipment in question complies with all applicable CPSA rules and all similar rules, bans, standards, and regulations applicable to the product or shipment under any other Act enforced by the Commission.
(c)
Availability of certificates
(1) Imports. In the case of imports, the certificate required by CPSA section 14(a) must be available to the Commission from the importer as soon as the product or shipment itself is available for inspection in the United States.
(2)
Domestic products. In the case of domestic products, the certificate required by CPSA section 14(a) must be available to the Commission from the manufacturer prior to introduction of the product or shipment in question into domestic commerce.
The process makes an identifiable party responsible for holding the testing information, and it provides a trail for later accountability, post sales. I am sure a good number of Chinese firms dummy this type of documentation. Although I have seen (and are more aware) of FDA regulatory filings from Chinese companies for medical devices such as battery operated wheelchairs. Its interesting to note that a company I know of sells about $500,000 of illegal electric wheelchairs into the US market that are direct shipped on a one by one basis from China to the destination; but I also know of another company with good documentation that had a series of FDA action letters.
Chinese electric wheelchair with FDA medical device papers FDA 510 (they had some issues with the FDA after they had an inspection in China if I remember);
https://www.medline.com/product/K2-Basic-Wheelchairs/Standard/Z05-PF78356
Chinese electric wheelchair w/o FDA certification - gray market!
http://www.ezlitecruiser.com/