No I would say the concept pre-datated it.
The Pauly guns, after Henry Roux owned the patents and companies modified the design to take a cartridge with a nipple:
And then Picherau who bought the patents and company from Roux continued with some of those as well as another modification to make it more like a typical percussion gun with an external nipple.
Lefaucheux would later buy the company and continue with the external nipple percussion gun design before making his pinfire cartridge.
But still before these you have Clement:
And Lepage:
Then after Pinfire you still had people exploring this option:
[img]
https://photos.smugmug.com/photos/i-SZgGZ4L/0/3572e26d/X3/i-SZgGZ4L-X3.jpg[/img]
[img]
https://photos.smugmug.com/photos/i-xzmsdjG/0/b68572bf/X3/i-xzmsdjG-X3.jpg[/img]