Well its clear that the "rhetoric only" approach isn't working and is insufficient. Bernies rhetoric here and in the video version are good. But its not any different than what we've been seeing, literally the entire time from other surrogates. It sums to "Trump worse".
And its not working. It hasn't moved the needle. Kamala has been declining in polling pretty precisely since she snubbed Muslim's at the DNC and then a week after that doubled down on it saying that "nothing would be different" in her administration relative to Biden's. Since then the scale and scope of Israels genocide have increased, and she's stayed the course to a continual decline in polling. Its not "the answer I want", its what the data have to say.
We're a week out from the election. You've convinced all the voters for whom "Trump worse" is a sufficient rhetorical approach.
Now what about the voters for whom that approach is insufficient. Is your plan to leave them on the table? Because it seems to me you aren't interested in getting their votes, and that puts the campaign in jeopardy.
There is a cohort that appears to be about 5% of voters for whom "Trump worse" is an ineffective argument. If not for a pivot on the part of Harris, what is your argument then to get those voters to show up and vote for her?