And testimony to that effect has been documented for Trump in his past.
However, in this specific instance, all we really know is that Trump recruited her because he recruits young blondes inton his PR team generally, and because she agrees with him on everything in the way that he wants her to agree with him.
And that's bad enough. We don't particularly need to start competing with the "but Kamala Harris slept her way to her career" crowd - it just wouldn't be that important even if it were true.