Here's a copy/paste from the testimony. I included his entire section specifically on the call for context. The statement you're remembering is bolded. I took this as his way of avoiding rehashing the contents of the call as part of his written testimony, as he immediately moves on to his impressions and what he did after the call.
I think it's fair to say that whatever edits he proposed that didn't make it into the transcript don't seem material enough (from his perspective) to have made his written remarks. I don't personally see the edits thing as a big deal because I don't think any of this hinges on parsing words in the call anyway.
On July 21, 2019, President Zelenskyy’s party won Parliamentary elections in a landslide victory. The NSC proposed that President Trump call President Zelenskyy to congratulate him.
On July 25, 2019, the call occurred. I listened in on the call in the Situation Room with colleagues from the NSC and the office of the Vice President. As the transcript is in the public record, we are all aware of what was said.
I was concerned by the call. I did not think it was proper to demand that a foreign government investigate a U.S. citizen, and I was worried about the implications for 6 the U.S. government’s support of Ukraine. I realized that if Ukraine pursued an investigation into the Bidens and Burisma, it would likely be interpreted as a partisan play which would undoubtedly result in Ukraine losing the bipartisan support it has thus far maintained. This would all undermine U.S. national security. Following the call, I again reported my concerns to NSC’s lead counsel.