They're not a Russian operative, they're using Nazi as shorthand for Zionist in an attempt to point out that Israel's actions in Palestine are utterly abhorrent and the genocide happening there should be regarded with similar disdain as the genocides of Nazi Germany and Harris has taken a hardline stance of continuing US military support to Israel.
But it's a clumsy shorthand, it's ineffective in communicating to American voters, as it lumps two different groups of white supremacists together when there's material distinctions that affect people living in America.
It's meant to be glib against Israelis who would shudder at being compared to the genociders of their ancestors, but it isn't Israelis voting in this election, so it mostly comes off as overly bitter.
It's an easy trap to fall into as a leftist in America, as there's so much abhorrently wrong with our political system, but that kind of vitriol isn't often pragmatic and using disdainful shorthand isn't useful in radicalizing the plurality of Americans necessary to revolutionize politics in this country.
P.S., For what it's worth, treefrog, I largely agree with you, but you gotta meet people where they are, not where you want em to be. I think you'll find that many people here are not folks who "just want to get back to brunch", this was a far more applicable concept in previous elections, but rather they're terrified of what harm could come from a second Trump term at home with regards to climate, economic (workers rights, etc.) and social policies targeting Muslims, POC, and LGBTQ people. What's happening in Palestine is so utterly vile and it's a gut wretchingly sad truth that no candidate that can win will make a significant difference on US policy towards Israel and the Palestinians. Harris should be called out on that. Lumping people who are going to begrudgingly vote against Trump for her as Nazi sympathizers just isn't useful rhetoric.
I was confused watching Reading Rainbow because I didn't understand how a blind man could be reading to me.
Lil bonus, I know first hand why floppy disks are called that, but only because my dad had some old games.