I keep seeing that claimed everywhere. I'll admit that I make an effort NOT to consume political ads (or ads in general really) but I don't remember anything right-leaning from Harris outside of supporting the status quo for Israel and Palestine.
I did hear ads on the radio in stores supporting making billionaires pay their fair share and lowering taxes for the working class. Ads attacking Trump for giving tax breaks to billionaires and wanting to cut Medicare and social security benefits. Ads supporting pro-choice and attacking Republicans for wanting to ban abortion. It's possible that there were ads for different demographics, but the same radio station was also airing right-wing ads with incredible amounts of transphobia- dead naming and misgendering individuals and claiming they were criminals coming for your children.
It's entirely possible I missed something because there's just way too much election content for one person to read, but I really have no clue where the narrative of the right turn is coming from.