I'm not sure why this is surprising, under current precedent,you can be forced to type in your password (https://articles.forensicfocus.com/2012/02/09/another-judge-... covers some cases, but there are a lot of cases).

Touch ID is not really different.

In general, one of the only reasons you won't be forced to type in your password is if the act of proving you have the password is somehow incriminating (IE there is a dispute over ownership, etc).