It seems so. If he'd already been the Emperor, I'd have wondered whether they weren't just bedazzled by the crown, but he wasn't even married to MT yet, and Hervey sounds way more critical about the Duke of Modena, visiting soon after, and just about any other German (or sort of German) visitor. Given how taken with FS Fritz sounds in the letter to Wilhelmine I quoted to you many a week ago, maybe really he was that charming (at least during the Grand Tour)?