Well, which is it?
I think he meant that Louis had no legitimate children, so his heir presumptive was Wilhelm.
There’s the interesting scene in The Prince Regent where his new wife (Caroline of Brunswick) is being escorted to London; she makes a comment suggesting she is anticipating the fun to be had surrounded by all these luscious young men, and her face drops when the prince’s man tells her “Oh, no, your grace, it would be a capital offense for them to even look at you wrongly.”