I’m surprised that no-one has mentioned that selling the Brooklyn Bridge is a very old scam, made famous by this huckster: https://en.m.wikipedia.org/wiki/George_C._Parker
New technology, same scam
New technology, same scam
That saying is a reference to the scams of George C. Parker who "sold" the Brooklyn Bridge a number of times to gullible people, and from the context of the video it is clear he is referring to that.
The drawing, of course, is quite ridiculous. But what else would you expect from one of the masterminds behind the "Ministry of Silly Walks"?