Whatever claims of anti-corruption he may have made in the past kinda fell out the window when he appointed his family to key political positions, one would think.
I don't understand your question. If he is ostensibly anti-corruption, the rampant and obvious nepotism is counter to that goal.
Unless he is simply anti-corruption that doesn't benefit him directly, in case rampant and obvious nepotism is not incompatible with his goal (but, I assume, not what voters were actually hoping for when they elected him).
Federal jobs, even near the top, pay so little that the nepotism claim is silly. This is a billionaire family, and we're supposed to be concerned with salary that is well below what a software developer can make?
Nepotism isn't about only salary, it's also about power and prestige. Because for a billionaire family(1), that's what matters past the dollars and cents. Ivanka Trump can afford to forego her salary, but no amount of money can buy the résumé entry "Former Senior Advisor to the President" and that past will open doors for her the rest of her life.
(1) It's also possible that the Trump family isn't actually as wealthy as they claim to be on paper, in which case being in a position to actually directly influence executive regulatory policy can have significant direct financial impact on their enterprises that they have no opportunity to exploit otherwise. For example, they could have a hand in implementing tax programs while owning significant financial interest in companies regulated by those tax programs (https://www.citizensforethics.org/press-release/crew-files-c...).