Setting aside the tech, which looks like an asynchronous await across a network, the interesting question is why Mistral would patent this in the US.

Simple, because the patent is less about protecting an invention than doing business in the US.

The US is more hospitable to software patents than Europe. A US patent also gives Mistral something useful when dealing with companies that already hold large patent portfolios: defensive leverage, cross-licensing, and one more asset on the books to make it attractive to investors.

There's a certain absurdity to it, and the French have a history with absurd. A French open-weights company crosses the Atlantic to put a patent around a loop, not because the code is remarkable, but because the American market makes the loop a valuable asset, business-wise.