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I was changing the screen for a coworker on an iPad Air 5. I’ve done a screen replacement twice for them but this time I accidentally forgot to disconnect the home button ribbon and yup it got sliced in half. Does TouchID stop working on iPad if you use a new cable? Is there a way to splice them?

you may be able to splice the existing cable to a replacement. however the replacement would most likely need to be an OEM one from another broken device or such, and would require microsoldering equipment/experience. a replacement home button may not have touch id but it’ll still work fine as a home button

Very simple answer to this question No you cannot splice them and you lose you fingerprint ID It may be possible to connect the broken cable together but you would want to be very good a microsoldering Even at that is it worth the time doing it