The company makes Flipper Zero as well. When they launched that product, the same topic came up [0]. The strongest argument given seems to hinge on the former nationality/residence of many of the original team. Obviously, different people will weight that above or below the UK address / USA incorporation.
the original team is Russian, but they downplay that a lot now (until you buy one and the promo stickers are in Russian). yes, they're registered in Delaware, almost every company that operates in the US is, including foreign companies.