Exactly! The TLDR on it is - Intel followed the terms of the BSD license.
Another way to read it is that thanks to the BSD license, Intel got an entire OS for free to use for their backdoor core but that doesn't matter really - the important part is that MINIX is now the most widely used OS in the world :-)
BSD Clause 3 requires they give credit.
Where are you from? I guess this must a cultural thing, because this letter does not sound passive-aggressive to me at all, not even one bit.
Sarcastic...more like ?
Which is part of being passive-aggressive, together with "resentment, fear of intimacy/competition"...