I don't think so. The email quoted from Tuomo is two years older than
the repost, so it is unlikely that it is in the context of Notion (also,
he never mentions Notion in it). I'm guessing he sent it out to the Ion
mailing list independently of Notion's existence (possibly before Notion
came about? not sure on the timeline), but we cannot assume it implies
acceptability of the Notion name.
Really, someone needs to ask politely. :)