Those Brompton tyres are rebranded older style Schwalbe Marathon Racers, the tread is identical.
Surely not. For one, the Brompton tires were invented in 2000 (the yellow one in pic along with the green one), this was (if I remember correctly) many years before a Schwalbe Marathon Racer even existed. Secondly the tire construction of the Brompton tire differs completely from the Schwalbes, materials, layers, etc. - all completely different. The Brompton green (which later became the Brompton Kevelar) i.e. was using a Kevelar insert - something absent from Schwalbe tires, they use different technologies. The weight of the tires is completely different (as is in fact the thread pattern). It is simply a completely different tire and the Brompton tires were made by a Chinese company (Chen-something, forgot the name). So your claim is as wrong as it can get.
Indeed the Brompton tires were heavily inspired by the Primo Comets, which were the only high pressure tires for 349 in the 90ies and they were available in kevelar and non-kevelar versions as well and the construction is relatively similar (though dimensions, weight and thread differ). The Comets were a well appreciated after-market accessory for the Brompton back then as Brompton were delivering the bikes with the very slow and very puncture sensitive and still relatively heavy low pressure
Raleigh Record tire. The Primos were way better in every single aspect and that led Brompton to create their own tire. The yellow one was discontinued in 2008, the green became the standard tire (until then the yellow was standard and the green kevelar one was standard on the higher ranked models only). The green became renamed and redesigned in 2013 and discontinued and exchanged in favor of the Marathon Racer in 2018.
If you want to think about "inspired" tires you should have a look at the Nutrak Sipped - it looks suspiciously like an older version of the standard Marathon threadwise (but is cheaper, faster and different regarding the construction).