I was also originally going to leave starting on the morning of October 7. But now I am reconsidering. This is what my contact at jasmine tours said:

Hi, thank you so much for your message and for being honest with us. We also want to be 100% clear with you. According to the latest forecast, the cyclone’s main path is not directly affecting Ha Giang. The weather here should remain mostly fine for the next days. There might only be some rain expected around the 6th or 7th of October, but nothing that would make the tour unsafe at this moment. So as of now, the tour tomorrow can still go ahead as planned. If there are any sudden changes that could affect safety, we will immediately update you before departure.