This tree does not have any grafts on it.
All updates:

(February 8, 2025) Inter-freeze update -- After a few weeks of intermittent mild to moderate freezes (lowest temperature of 25.7°F/-3.5°C), this tree has lost most of the leaves other than in the lower/inner canopy, and the growing tips (which had been actively flushing) are crispy on the stems as well.