I ink the part that Satoshi wrote it.
They were discussing about scalability and transaction rate there. It is better to get such information directly on this forum to actually know the reason it was said.
Thanks for linking the original post of Satoshi; I haven't used the search button on the forum, hence I missed this part. Though they had discussed the scalability and transaction rates, it seems right now that things are going very well for every Bitcoin holder. Before reading your link, I thought Satoshi talked about Bitcoin potentially, to be honest. Whatever the purpose of the quote, it seems it's become famous nowadays.