The stock DTHs were changed a few months ago to stop reporting “isphysical” because they found out that just wasn’t reliable. For example, if the message went through a repeater, it would not be reported as a physical change even though it had been. This help explain why the various double tap smartapps worked for some people but not for others. Or even some switches in a home and not others.
There was no announcement of this, it was just quietly deprecated during one of the various firmware changes. But it was discussed in the forms because of the smartapps failing.