I don't know about the alternators at your link, but permanent magnet alternators have been common on small engines (e.g. motorcycles, outboard motors, etc.) for decades. The simple answer is since the field can't be regulated, the stator output is regulated. Or there's no regulation at all, which was the case before solid-state regulators became practical in the eighties.
There are two types of regulators used in small engines: shunt and series. The shunt type is more common and uses SCRs (silicon-controlled rectifiers) to shunt the stator output to ground when the voltage exceeds the regulated level. Series regulators use transistors (usually MOSFETs) to limit the current from the stator and regulate the battery voltage.
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