Look at your analytics. Do you have had any traffic coming from within Itch prior to the update? Like from https://itch.io/games/newest
Your game is currently not indexed. That can happen for a new release and after every update. Indexing can take longer than a month. So your game is either de-listed temporarily because of the update, or because of other reasons, or it was never indexed and is still in the queue for staff review.
Since your Itch site appears #2 for https://duckduckgo.com/?q=box+grinder+game&ia=web makes me think the game is temporarily de-listed for one reason or another.
The boost in visibility does not come from the devlog itself. You need a lot of followers for that. People see devlogs in their feed if they follow you. And randomly browsing in https://itch.io/devlogs is not a thing many people do.
In theory, a major devlog can be staff approved, and that will bump your time stamp on the recent list. So you appear for a short time as a new game again. But a devlog after a month will not be plausible. It's just an update, and your game is not the game itself, but a demo. I would not approve such a devlog to be a major update, if I had any say in it.
Also in theory, your game might violate quality guidelines and be intentionally unindexed. https://itch.io/docs/creators/quality-guidelines#avoid-only-uploading-keys-or-li...
Oh, and it is strange, that I see the updated file in your devlog. You have a webgame. I should not see files in the devlog.