-snip-
Merging posts are okay, as it only "merging" multiple posts in a single post. But the one on the thread mentioned by hosseinimr93 is different, there's no note for merging posts, the mod just edited the post for some reason.
Oh my bad - sorry, now I see what you mean.
In the above case - I also think the same, the moderator does not send a notification to the author of the thread whose post has been edited. The reason for the edit can vary - such as removing a referral link in the thread or other links instead of deleting the thread.
I'm not sure what was edited from that post - you can compare it to the archived post by ninjastic. I can't find anything different - both posts are exactly the same with no edit history.
Source:
https://ninjastic.space/post/52162302