In general, the important thing is that edits are happening and that they're not being done in a way that's hidden so that no one is aware of them. The fact that an edit bumps a post is an important part of making sure that edit gets reviewed, so feel free to take a look and see if the edit was correct.
If a user were doing this en-masse and the posts didn't bump, they could do a ton of damage to the site with no one the wiser - that'd be much worse than a few hours of the home page being flooded.
In this specific case, the user made 17 edits - which is less than half of the 50 visible on the front page (if you view 50). So that's not as huge of a problem as it can be. Even in this specific case, I think the volume isn't too bad. But, feel free to check the per-site policy. Some sites have an expectation that big editing work be done in smaller chunks to avoid flooding the front page.
Some sites also request or suggest that major retagging events be done as part of a group effort to make sure that there's agreement in whether the retagging is appropriate.