Can I delete and reimport Health data?

I use a Withings sleep monitor pad and export that data to Apple Health. Over the past few weeks, the monitor has gathered data well before I actually went to bed. The early data is erroneous. I can delete that data in the Withings app, but the deletion is not exported to Apple Health, which then retains the erroneous data.

I thought to delete all sleep data from Apple Health and then re-export from Withings. But it doesn't look like bulk deletion is possible, meaning I would have to delete each of 4 readings for each day one-by-one. It isn't worth the time to delete a few hundred readings to correct Apple Health's data (and I'm not sure Withings would re-export it anyway).

Is there a way to do bulk deletions from Apple Health? Is it a bug that edited Withings data is not sync'ed/re-exported?