The butterfly effects would add up and and any zygote formed would not be the hitler-as-we-know anymore, since it would be a different combination of sperm and eggs.
Who needs guns when you got a time machine? Don’t like your highschool bully, just bump into their parents back in time. Or you know, “bump” ( ͡° ͜ʖ ͡°) into their parents.
That’s not how any of this works. Not-quite-Hitler would still be exposed to the same influences and grow up to be the same person.
But its technically not your timeline’s hitler anymore.
Who knows, maybe this offspring produced by the same parents turned out to be XX chromosomes (aka: assigned female at birth) and therefore would not be in the same trajectory given the extreme-patriarchal and misogynistic society at the time. Or maybe even if he turned out to be assigned male at birth, he would have a slighly different personality that cause him to get shot to death in WW1.
But either way, you still caused your hitler to cease to exist.