ANSWER:

Yes, they must redo the wudu before praying but this has no impact on your ghusul. 

What to do if you pass wind or call of nature during ghusl? Does this require someone to redo wudhu after finished?

Ablution (Wudhu), Purity | October 22, 2020 10:50 pm
Previous

To uplift major impurity we need to take ghusl. But do we need to take intention of both major and minor or only major will suffice and minor will automatically come under it and we will have wudu.
Next

If one smokes,does it nullify the ablution or Salah when the odour still smells on the person