Looking at Burr's history, you have to think this is a SSS anomaly, he's always thrown 95 or so, had one decent half season in the majors in 2021, otherwise an AAA+ pitcher.
If he keeps it up, maybe the cutter/curve are new/improved pitches?
A jump like this is usually a guy recovering from injuries and finally reaching his potential, but in this case there's no reason to expect a jump.