I disagree. Most people will read that as saying the changes he made were inconsequential (in other words the changes "basically amounted to nothing").

https://idioms.thefreedictionary.com/amount+to+nothing

If you meant inadequate (weren't enough), rather than inconsequential (had little to no effect) you could have said it.

Edit: That's not to mention that you twice doubled down on the idea he "did nothing" in other comments.