Not significant by itself, but may provide further leads, his public email address from May 2000
hwl@math.leidenuniv.nl.
That's Lenstra's email, are you saying that was the email of the guy in 2002 that put out the idea that some think is Satoshi?
Or are you saying yeah this is Lenstra's known email from 2000 era?
Lenstra is a major figure in crypto and that is a good reason to implicate him as Satoshi in that post above saying the main crypto guy in ECC that may have posted that 2002 post was in NL as the post to usenet came from there.
When you start looking at major crypto guys you have
USA Koblitz (curves used in btc)
NL Lenstra (created ECC)
Canada (several guys)
A few euro countries (several guys)
Maybe Lenstra was part of the group Satoshi.