I would certainly say the code for ithreads was written with the goal of emulating fork and that it shares most of the drawbacks of pre-copy-on-write fork - except for being much more inefficient due to perl being forced into the role of OS and not having good tools for that.
But I don't see how you could possibly intend that to bring this thread to a close. You continue to argue against a blanket statement "threads emulate forks" instead of against either whatever "political" message you think was behind Tye
connecting the two or against the specific aspect of fork that Tye
was explicitly referring to.