They’re not endorsing her because they think she’s conservative. They’re endorsing her because they know Trump is on his last leg and they are trying to distance themselves from him.
Immediately after the election settles, they will start criticizing everything Harris does again while trying to build up their version of the Republican party. They’re looking to reboot it without Trump, and this is the way to do it.
I don’t think he’s as far off as they suggest. I remember the whole world laughing every time he spoke.