Those 10K range cars are much lower quality/battery/finish/size/etc... and that's before any shipping, taxes and likely adding any safety features required to adhere to rules to US/EU market.
Given it's selling in NL it will meet EU safety standards, but granted, that's a far cry from €10K and still very far removed from affordable / budget.
Note that I think the BYD quote of 29 or 30k euros is including VAT [1] which is 21% in the Netherlands. On the other hand the quote given above as the starting price in the US for the Mach-E not include sales tax. In the Netherlands (trying to compare apples to apples), the Mach-E is being sold for €75200 [2]. Significant price gap in that market.
You can get Mustang mach-e, basic for 46K (check ford.nl...), you are looking at the GT version there which is much much nicer compares to the 30k BYD.
You can gey hyundai kona starting from 37k with 65kwh battery as opposed to byd 44kwh for 30k. So more value for money.
Apples to Apples is Dacia Spring Extreme 44kwh for 23.5K with tax for same battery and features... much lower price then BYD
That BYD is equivalent to a 23.5K dacia spring extreme... so similar quality can be had cheaper.
American cars are much nicer (tesla?), or have better reputation then a recent foreign company with no accountability if they decide to pack up and leave customers stranded... Or if China decides to invade taiwan and get embargoed.