A short PR can be a normal variant, but it sometimes reflects faster-than-usual AV-node conduction or, less commonly, an accessory electrical pathway. In classic WPW pre-excitation, there is also usually a
wide QRS and delta wave; those are not obvious here. This is consistent with the machine wording: “Sinus rhythm with short PR, otherwise normal ECG.” A short PR by itself does not establish WPW.
MSD description of WPW ECG features