I have been following the recent block size debates through the mailing list. .....
Satoshi Nakamoto
I had not seen that letter until now, but it looks like a lot of vague bla-bla without even a hint of a technical argument.
I'll eat my hat if that was written by any of the very skilled mathematician/cryptographer(s) that designed bitcoin.
What did you expect to read? Maths and crypto, for things related to social engineering, populist methods, consensus and forks?
Yes. That is what technical people do. As a first public response in years, they would write a detailed and (mathematically) well supported response about why there orignal design is still good, or why and how it should be improved, not a short note without any technical support of there opinion.
Study the original paper and learn how cleverly all technical aspects fit together, and ask yourself if someone who designed that would write such a vague letter without properly substantiating and supporting his opinions.