I think the bike itself is OK, but the problem is unsuitable shipping and actually quite steep price. Interestingly enough he purchased the bike directly from Litepro.
Time will tell if the bike itself really is ok. Regarding the price he seems to have a lot of luck. He paid:
800$ for the bike
15$ for the shipment
On top of that he should have paid:
27% Hungarian VAT
10% import customs
48,5% anti-dumping tarif for bike imports to the EU from China (1)
With all import duties applied legally correct this would then sum up to something in the area of 1500$. Not really a bargain in comparison to a real genuine Brompton if you ask me. The poster of the video missed to take the anti-dumping tarifs into account and furthermore missed to take customs into account - he just calcultated with the Hungarian VAT. Which then he was lucky not to be charged with. Plus the seller gave him a 300$ rebate afterwards for the damages the bike suffered from during transport. So effectively he paid just 500$ - 1/3 of what he legally was ought to pay. Plus he was lucky that the customs in hungary did obviously not only not honor the import laws but also not recognize the fact that he imported a counterfeit product - otherwise he had had the risk of the bike being confiscated at customs with a total loss of his money as a consequence (plus possibly a fine for trying an illegal import).
However: For judging on the bike one should have in mind the price gap he paid to a legal price and if one thinks about importing one one should consider the cost and the potential risk involved. With all that in mind importing a fake Brompton from China seems not at all attractive to me, not even if the bike would be equal to a Brompton in terms of quality.
So the price he paid is not at all steep - 500$, really? Being too greedy often leeds to simply wasting your money completely...
So in the end you have the choice to
a) go to a shop, buy a Brompton for ~1500€, known qualitiy, warranty, well know spare parts situation, fully legal, high resale value
b) taking a bet: pay a company in China 800$ plus shipping for a fake Brompton, get hopefully something but clearly of unknown quality and in unknown state, possibly no warranty an no spare parts, a low to non existent resale value and possibly no bike at all. You end up paying something between 500$ and 1500$ for a triple or quadruple bet and safely with a product (if at all) that is of considerably lower quality than an original Brompton in many aspects.
One must be either a serious gambler or a really stupid person to take that bet and the risks tied to it in my opinion. If you are short on money it is even more stupid to take the risk of a total loss or a bike that's not fit for purpose - you should better avoid risks in such a situation and would be far better off to buy a used original Brompton for possibly around 1000€ (or even a A-line), so in the area of what you are willing/able to invest anyway but w/o the risk.
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(1) anti dumping tarifs against bikes (apart from ebikes) from China have been active as long as since 1993. They have been finally decided in their latest revision at the beginning of 2019 with the following amounts:
Zhejiang Baoguilai Vehicle Co. Ltd.: 19,2 %
Oyama Bicycles (Taicang) Co. Ltd.: 0 %
Ideal (Dongguan) Bike Co. Ltd.: 0 %
Giant China Co. Ltd.: 0 %
all others : 48,5 %
Here's the current list of goods with anti-dumping tax of Dec. 2021 (from Austria, but should apply to all EU countries including Hungary):
https://www.bmdw.gv.at/dam/jcr:f0b5545e-19ac-446a-be2b-c88beccaaf27/Antidumping Warenliste.pdf
Here's the according EU legal document:
https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:32019R0073&qid=1548320414059&from=DE