If that's the case, you should just resign to putting in more work, more thinking.
Theme battles (particularly genre themes) can be too easy to end up going too far in the wrong direction--- happened to me a couple times.
The key, which I also told
@BiggChev before in a different context (tagging him in because relevant to his post) is keeping "Hip Hop" as your North Star when approaching those themes.
This means you're asking yourself does this sound Hip-Hop. It means knowing your key markers for what keeps it sounding Hip-Hop and ensuring those stay in place; whether that's tempo, drum choice etc.
Then adding enough of the theme to indicate that topic/genre.
In regards to this theme, it shouldn't have been so challenging, cause it just said use synths. Plenty of Hip Hop is synth based, there was no need to drift off genre with this one. The only people I'd imagine would potentially struggle are the Sample(record) Based producers who don't do much composition. But even then! Actually, no one should have struggled - ha!