Yes, if your post is the next one made after a thread subscriber's last visit to the forum, (s)he'll get an e-mail containing the text of your original post. Subsequent edits and deletions won't be notified.
I've fallen foul of this myself, once: I posted, noticed I'd effectively duplicated someone else's post (which I should have read but hadn't) and so deleted within a few seconds of posting. Then another poster turned up, looking to reply to some specific wording I'd used, and couldn't find the post, so used the version they'd received in e-mail. They assumed the forum software had glitched, as seems to have happened on your thread. On that occasion there was no great harm done, other than my embarrassment at having to explain the deletion.
I've since been caught at the other end of the problem: receiving the e-mail and bouncing on to the forum to reply, only to discover that the poster has removed the post. Given my own experience, I then assume the removal was deliberate, and maintain a diplomatic silence. It seems to me that those who edit long replies off-line would be well-advised to at least connect to the forum to pick up the current version of the post they're replying to, since people often enough change a word or two or add an afterthought in the few minutes after the original post, even though outright deletions are rare.

I've since thought that what I should do on BAUT, if I ever really want to retract a post, is to edit out the original text but to write a formal retraction in its place.

Grant Hutchison