I assume so as well.
Right now the download link still appears in but it says “Your download is ready. If you haven’t received the email with your link, click above to resend it.”
I am assuming that I will be able to download it again at some point in the future and have it be updated… However, I am not counting on that. I have started using Tweet Library and am testing out Watermark.
Watermark, in particular, looks very useful, but it seems to be stalling on importing my archive. (Which is only 4 MB when .zipped, btw.)
I can confirm this. I got my Twitter archive a few weeks ago, and when I went back today I was able to request it again.